66651010056 has 48 divisors (see below), whose sum is σ = 187198830000. Its totient is φ = 22217002704.

The previous prime is 66651009989. The next prime is 66651010057. The reversal of 66651010056 is 65001015666.

It is a super-3 number, since 3×66651010056³ (a number of 33 digits) contains 333 as substring.

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

It is a self number, because there is not a number n which added to its sum of digits gives 66651010056.

It is not an unprimeable number, because it can be changed into a prime (66651010057) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17140806 + ... + 17144693.

It is an arithmetic number, because the mean of its divisors is an integer number (3899975625).

Almost surely, 2^66651010056 is an apocalyptic number.

It is an amenable number.

66651010056 is an abundant number, since it is smaller than the sum of its proper divisors (120547819944).

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

66651010056 is a wasteful number, since it uses less digits than its factorization.

66651010056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34285520 (or 34285504 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The spelling of 66651010056 in words is "sixty-six billion, six hundred fifty-one million, ten thousand, fifty-six".