642979979246 has 12 divisors (see below), whose sum is σ = 1060119883536. Its totient is φ = 292263626820.

The previous prime is 642979979177. The next prime is 642979979269.

642979979246 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×642979979246² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

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, 1328470790 + ... + 1328471273.

It is an arithmetic number, because the mean of its divisors is an integer number (88343323628).

Almost surely, 2^642979979246 is an apocalyptic number.

642979979246 is a deficient number, since it is larger than the sum of its proper divisors (417139904290).

642979979246 is a wasteful number, since it uses less digits than its factorization.

642979979246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2656942087 (or 2656942076 counting only the distinct ones).

The product of its digits is 740710656, while the sum is 74.

The spelling of 642979979246 in words is "six hundred forty-two billion, nine hundred seventy-nine million, nine hundred seventy-nine thousand, two hundred forty-six".