66553704 has 64 divisors (see below), whose sum is σ = 211286400. Its totient is φ = 19014912.

The previous prime is 66553693. The next prime is 66553709. The reversal of 66553704 is 40735566.

It is a super-2 number, since 2×66553704² = 8858791032239232, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (66553709) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20497 + ... + 23520.

It is an arithmetic number, because the mean of its divisors is an integer number (3301350).

Almost surely, 2^66553704 is an apocalyptic number.

It is an amenable number.

66553704 is an abundant number, since it is smaller than the sum of its proper divisors (144732696).

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

66553704 is a wasteful number, since it uses less digits than its factorization.

66553704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44039 (or 44029 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 36.

The square root of 66553704 is about 8158.0453541274. The cubic root of 66553704 is about 405.2509829769.

The spelling of 66553704 in words is "sixty-six million, five hundred fifty-three thousand, seven hundred four".