66254135920 has 40 divisors (see below), whose sum is σ = 176046705504. Its totient is φ = 22715703552.

The previous prime is 66254135917. The next prime is 66254135947. The reversal of 66254135920 is 2953145266.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×66254135920² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59154919 + ... + 59156038.

Almost surely, 2^66254135920 is an apocalyptic number.

It is an amenable number.

66254135920 is an abundant number, since it is smaller than the sum of its proper divisors (109792569584).

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

66254135920 is a wasteful number, since it uses less digits than its factorization.

66254135920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118310977 (or 118310971 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 43.

The spelling of 66254135920 in words is "sixty-six billion, two hundred fifty-four million, one hundred thirty-five thousand, nine hundred twenty".