66077156621564 has 18 divisors (see below), whose sum is σ = 127102960361832. Its totient is φ = 30035071191400.

The previous prime is 66077156621563. The next prime is 66077156621587. The reversal of 66077156621564 is 46512665177066.

It is a junction number, because it is equal to n+sod(n) for n = 66077156621497 and 66077156621506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66077156621563) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 68261524952 + ... + 68261525919.

Almost surely, 2^{66077156621564} is an apocalyptic number.

It is an amenable number.

66077156621564 is a deficient number, since it is larger than the sum of its proper divisors (61025803740268).

66077156621564 is a wasteful number, since it uses less digits than its factorization.

66077156621564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136523050897 (or 136523050884 counting only the distinct ones).

The product of its (nonzero) digits is 76204800, while the sum is 62.

The spelling of 66077156621564 in words is "sixty-six trillion, seventy-seven billion, one hundred fifty-six million, six hundred twenty-one thousand, five hundred sixty-four".