66156634663500 has 96 divisors (see below), whose sum is σ = 192649975644672. Its totient is φ = 17641599326400.

The previous prime is 66156634663429. The next prime is 66156634663501. The reversal of 66156634663500 is 536643665166.

It is a happy number.

66156634663500 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (66156634663501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 270848427 + ... + 271092573.

It is an arithmetic number, because the mean of its divisors is an integer number (2006770579632).

Almost surely, 2^{66156634663500} is an apocalyptic number.

66156634663500 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66156634663500 is an abundant number, since it is smaller than the sum of its proper divisors (126493340981172).

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

66156634663500 is a wasteful number, since it uses less digits than its factorization.

66156634663500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424816 (or 424804 counting only the distinct ones).

The product of its (nonzero) digits is 41990400, while the sum is 57.

The spelling of 66156634663500 in words is "sixty-six trillion, one hundred fifty-six billion, six hundred thirty-four million, six hundred sixty-three thousand, five hundred".