66991157648376 has 64 divisors (see below), whose sum is σ = 180499870135200. Its totient is φ = 20596771196928.

The previous prime is 66991157648351. The next prime is 66991157648413. The reversal of 66991157648376 is 67384675119966.

It is a Harshad number since it is a multiple of its sum of digits (78).

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, 82369141 + ... + 83178468.

Almost surely, 2^{66991157648376} is an apocalyptic number.

It is an amenable number.

66991157648376 is an abundant number, since it is smaller than the sum of its proper divisors (113508712486824).

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

66991157648376 is a wasteful number, since it uses less digits than its factorization.

66991157648376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165548928 (or 165548924 counting only the distinct ones).

The product of its digits is 2469035520, while the sum is 78.

The spelling of 66991157648376 in words is "sixty-six trillion, nine hundred ninety-one billion, one hundred fifty-seven million, six hundred forty-eight thousand, three hundred seventy-six".