66261552 has 40 divisors (see below), whose sum is σ = 195630336. Its totient is φ = 18931776.

The previous prime is 66261523. The next prime is 66261553. The reversal of 66261552 is 25516266.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (66261553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98268 + ... + 98939.

Almost surely, 2^66261552 is an apocalyptic number.

It is an amenable number.

66261552 is an abundant number, since it is smaller than the sum of its proper divisors (129368784).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66261552 is a wasteful number, since it uses less digits than its factorization.

66261552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197225 (or 197219 counting only the distinct ones).

The product of its digits is 21600, while the sum is 33.

The square root of 66261552 is about 8140.1199008368. The cubic root of 66261552 is about 404.6571339906.

The spelling of 66261552 in words is "sixty-six million, two hundred sixty-one thousand, five hundred fifty-two".