642430131556 has 6 divisors (see below), whose sum is σ = 1124252730230. Its totient is φ = 321215065776.

The previous prime is 642430131517. The next prime is 642430131583. The reversal of 642430131556 is 655131034246.

It can be written as a sum of positive squares in only one way, i.e., 627881912100 + 14548219456 = 792390^2 + 120616^2 .

It is a super-2 number, since 2×642430131556² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80303766441 + ... + 80303766448.

Almost surely, 2^642430131556 is an apocalyptic number.

It is an amenable number.

642430131556 is a deficient number, since it is larger than the sum of its proper divisors (481822598674).

642430131556 is a wasteful number, since it uses less digits than its factorization.

642430131556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160607532893 (or 160607532891 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 40.

The spelling of 642430131556 in words is "six hundred forty-two billion, four hundred thirty million, one hundred thirty-one thousand, five hundred fifty-six".