66637748924 has 24 divisors (see below), whose sum is σ = 122073348096. Its totient is φ = 31789926000.

The previous prime is 66637748899. The next prime is 66637748927. The reversal of 66637748924 is 42984773666.

It is a Harshad number since it is a multiple of its sum of digits (62).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66637748927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3775712 + ... + 3793319.

It is an arithmetic number, because the mean of its divisors is an integer number (5086389504).

Almost surely, 2^66637748924 is an apocalyptic number.

It is an amenable number.

66637748924 is a deficient number, since it is larger than the sum of its proper divisors (55435599172).

66637748924 is a wasteful number, since it uses less digits than its factorization.

66637748924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7569137 (or 7569135 counting only the distinct ones).

The product of its digits is 73156608, while the sum is 62.

The spelling of 66637748924 in words is "sixty-six billion, six hundred thirty-seven million, seven hundred forty-eight thousand, nine hundred twenty-four".