66690552 has 32 divisors (see below), whose sum is σ = 166960080. Its totient is φ = 22199040.

The previous prime is 66690523. The next prime is 66690553. The reversal of 66690552 is 25509666.

It is a self number, because there is not a number n which added to its sum of digits gives 66690552.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66690553) 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, 21108 + ... + 24060.

Almost surely, 2^66690552 is an apocalyptic number.

It is an amenable number.

66690552 is an abundant number, since it is smaller than the sum of its proper divisors (100269528).

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

66690552 is a wasteful number, since it uses less digits than its factorization.

66690552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3903 (or 3899 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 39.

The square root of 66690552 is about 8166.4283502643. The cubic root of 66690552 is about 405.5285523968.

The spelling of 66690552 in words is "sixty-six million, six hundred ninety thousand, five hundred fifty-two".