66871432456 has 64 divisors (see below), whose sum is σ = 133494609600. Its totient is φ = 31348923648.

The previous prime is 66871432423. The next prime is 66871432471. The reversal of 66871432456 is 65423417866.

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, 1706475 + ... + 1745221.

It is an arithmetic number, because the mean of its divisors is an integer number (2085853275).

Almost surely, 2^66871432456 is an apocalyptic number.

It is an amenable number.

66871432456 is a deficient number, since it is larger than the sum of its proper divisors (66623177144).

66871432456 is a wasteful number, since it uses less digits than its factorization.

66871432456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38998 (or 38994 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 52.

The spelling of 66871432456 in words is "sixty-six billion, eight hundred seventy-one million, four hundred thirty-two thousand, four hundred fifty-six".