66157777015656 has 32 divisors (see below), whose sum is σ = 165396976164000. Its totient is φ = 22052254521920.

The previous prime is 66157777015633. The next prime is 66157777015721. The reversal of 66157777015656 is 65651077775166.

66157777015656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×66157777015656² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 19511706 + ... + 22649993.

It is an arithmetic number, because the mean of its divisors is an integer number (5168655505125).

Almost surely, 2^{66157777015656} is an apocalyptic number.

It is an amenable number.

66157777015656 is an abundant number, since it is smaller than the sum of its proper divisors (99239199148344).

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

66157777015656 is a wasteful number, since it uses less digits than its factorization.

66157777015656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42227089 (or 42227085 counting only the distinct ones).

The product of its (nonzero) digits is 388962000, while the sum is 69.

The spelling of 66157777015656 in words is "sixty-six trillion, one hundred fifty-seven billion, seven hundred seventy-seven million, fifteen thousand, six hundred fifty-six".