97666384638 has 16 divisors (see below), whose sum is σ = 195359677056. Its totient is φ = 32550976920.

The previous prime is 97666384603. The next prime is 97666384661. The reversal of 97666384638 is 83648366679.

It is a congruent number.

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, 1073818 + ... + 1161213.

It is an arithmetic number, because the mean of its divisors is an integer number (12209979816).

Almost surely, 2^97666384638 is an apocalyptic number.

97666384638 is an abundant number, since it is smaller than the sum of its proper divisors (97693292418).

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

97666384638 is a wasteful number, since it uses less digits than its factorization.

97666384638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2242319.

The product of its digits is 188116992, while the sum is 66.

The spelling of 97666384638 in words is "ninety-seven billion, six hundred sixty-six million, three hundred eighty-four thousand, six hundred thirty-eight".