66323157768 has 96 divisors (see below), whose sum is σ = 209475552000. Its totient is φ = 18949466592.

The previous prime is 66323157697. The next prime is 66323157773. The reversal of 66323157768 is 86775132366.

66323157768 is a `hidden beast` number, since 6 + 6 + 3 + 2 + 3 + 1 + 577 + 68 = 666.

It is a super-2 number, since 2×66323157768² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1318096 + ... + 1367487.

It is an arithmetic number, because the mean of its divisors is an integer number (2182037000).

Almost surely, 2^66323157768 is an apocalyptic number.

It is an amenable number.

66323157768 is an abundant number, since it is smaller than the sum of its proper divisors (143152394232).

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

66323157768 is a wasteful number, since it uses less digits than its factorization.

66323157768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2685616 (or 2685595 counting only the distinct ones).

The product of its digits is 7620480, while the sum is 54.

The spelling of 66323157768 in words is "sixty-six billion, three hundred twenty-three million, one hundred fifty-seven thousand, seven hundred sixty-eight".