642657198124 has 6 divisors (see below), whose sum is σ = 1124650096724. Its totient is φ = 321328599060.

The previous prime is 642657198091. The next prime is 642657198163. The reversal of 642657198124 is 421891756246.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80332149762 + ... + 80332149769.

Almost surely, 2^642657198124 is an apocalyptic number.

It is an amenable number.

642657198124 is a deficient number, since it is larger than the sum of its proper divisors (481992898600).

642657198124 is a wasteful number, since it uses less digits than its factorization.

642657198124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160664299535 (or 160664299533 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 55.

The spelling of 642657198124 in words is "six hundred forty-two billion, six hundred fifty-seven million, one hundred ninety-eight thousand, one hundred twenty-four".