66689044156 has 48 divisors (see below), whose sum is σ = 137923140096. Its totient is φ = 27623179584.

The previous prime is 66689044141. The next prime is 66689044171. The reversal of 66689044156 is 65144098666.

It is an interprime number because it is at equal distance from previous prime (66689044141) and next prime (66689044171).

It is a super-2 number, since 2×66689044156² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66689044097 and 66689044106.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 235936 + ... + 434791.

It is an arithmetic number, because the mean of its divisors is an integer number (2873398752).

Almost surely, 2^66689044156 is an apocalyptic number.

It is an amenable number.

66689044156 is an abundant number, since it is smaller than the sum of its proper divisors (71234095940).

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

66689044156 is a wasteful number, since it uses less digits than its factorization.

66689044156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670858 (or 670856 counting only the distinct ones).

The product of its (nonzero) digits is 7464960, while the sum is 55.

The spelling of 66689044156 in words is "sixty-six billion, six hundred eighty-nine million, forty-four thousand, one hundred fifty-six".