66736643724 has 18 divisors (see below), whose sum is σ = 168695405060. Its totient is φ = 22245547896.

The previous prime is 66736643719. The next prime is 66736643747. The reversal of 66736643724 is 42734663766.

66736643724 is a `hidden beast` number, since 66 + 73 + 66 + 437 + 24 = 666.

66736643724 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 926897794 + ... + 926897865.

Almost surely, 2^66736643724 is an apocalyptic number.

It is an amenable number.

66736643724 is an abundant number, since it is smaller than the sum of its proper divisors (101958761336).

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

66736643724 is a wasteful number, since it uses less digits than its factorization.

66736643724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1853795669 (or 1853795664 counting only the distinct ones).

The product of its digits is 18289152, while the sum is 54.

The spelling of 66736643724 in words is "sixty-six billion, seven hundred thirty-six million, six hundred forty-three thousand, seven hundred twenty-four".