66161299 has 4 divisors (see below), whose sum is σ = 66182536. Its totient is φ = 66140064.

The previous prime is 66161281. The next prime is 66161321. The reversal of 66161299 is 99216166.

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

It is a cyclic number.

It is not a de Polignac number, because 66161299 - 2⁷ = 66161171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66161699) 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, 4929 + ... + 12514.

It is an arithmetic number, because the mean of its divisors is an integer number (16545634).

Almost surely, 2^66161299 is an apocalyptic number.

66161299 is a deficient number, since it is larger than the sum of its proper divisors (21237).

66161299 is a wasteful number, since it uses less digits than its factorization.

66161299 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21236.

The product of its digits is 34992, while the sum is 40.

The square root of 66161299 is about 8133.9596138658. The cubic root of 66161299 is about 404.4529503812.

The spelling of 66161299 in words is "sixty-six million, one hundred sixty-one thousand, two hundred ninety-nine".