66625315656 has 32 divisors (see below), whose sum is σ = 167666366400. Its totient is φ = 22061361600.

The previous prime is 66625315651. The next prime is 66625315667. The reversal of 66625315656 is 65651352666.

It is a junction number, because it is equal to n+sod(n) for n = 66625315599 and 66625315608.

It is not an unprimeable number, because it can be changed into a prime (66625315651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9188611 + ... + 9195858.

It is an arithmetic number, because the mean of its divisors is an integer number (5239573950).

Almost surely, 2^66625315656 is an apocalyptic number.

It is an amenable number.

66625315656 is an abundant number, since it is smaller than the sum of its proper divisors (101041050744).

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

66625315656 is a wasteful number, since it uses less digits than its factorization.

66625315656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18384629 (or 18384625 counting only the distinct ones).

The product of its digits is 5832000, while the sum is 51.

The spelling of 66625315656 in words is "sixty-six billion, six hundred twenty-five million, three hundred fifteen thousand, six hundred fifty-six".