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66998297 = 149449653
BaseRepresentation
bin1111111110010…
…1000000011001
311200001212101102
43333211000121
5114122421142
610352001145
71442322212
oct377450031
9150055342
1066998297
11349008a3
121a5301b5
1310b5a482
148c80409
155d36532
hex3fe5019

66998297 has 4 divisors (see below), whose sum is σ = 67448100. Its totient is φ = 66548496.

The previous prime is 66998291. The next prime is 66998303. The reversal of 66998297 is 79289966.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (66998291) and next prime (66998303).

It can be written as a sum of positive squares in 2 ways, for example, as 10010896 + 56987401 = 3164^2 + 7549^2 .

It is a cyclic number.

It is not a de Polignac number, because 66998297 - 212 = 66994201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66998291) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 224678 + ... + 224975.

It is an arithmetic number, because the mean of its divisors is an integer number (16862025).

Almost surely, 266998297 is an apocalyptic number.

It is an amenable number.

66998297 is a deficient number, since it is larger than the sum of its proper divisors (449803).

66998297 is a wasteful number, since it uses less digits than its factorization.

66998297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449802.

The product of its digits is 2939328, while the sum is 56.

The square root of 66998297 is about 8185.2487439295. The cubic root of 66998297 is about 406.1513688132.

The spelling of 66998297 in words is "sixty-six million, nine hundred ninety-eight thousand, two hundred ninety-seven".

Divisors: 1 149 449653 66998297