66520021676 has 24 divisors (see below), whose sum is σ = 118076150640. Its totient is φ = 32786856000.

The previous prime is 66520021669. The next prime is 66520021691. The reversal of 66520021676 is 67612002566.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 266990 + ... + 452021.

It is an arithmetic number, because the mean of its divisors is an integer number (4919839610).

Almost surely, 2^66520021676 is an apocalyptic number.

It is an amenable number.

66520021676 is a deficient number, since it is larger than the sum of its proper divisors (51556128964).

66520021676 is a wasteful number, since it uses less digits than its factorization.

66520021676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 719345 (or 719343 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 41.

The spelling of 66520021676 in words is "sixty-six billion, five hundred twenty million, twenty-one thousand, six hundred seventy-six".