642051007081 has 8 divisors (see below), whose sum is σ = 712290794400. Its totient is φ = 573789805440.

The previous prime is 642051007057. The next prime is 642051007099. The reversal of 642051007081 is 180700150246.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 642051007081 - 2³⁵ = 607691268713 is a prime.

It is a super-2 number, since 2×642051007081² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642051007021) 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, 494645736 + ... + 494647033.

It is an arithmetic number, because the mean of its divisors is an integer number (89036349300).

Almost surely, 2^642051007081 is an apocalyptic number.

It is an amenable number.

642051007081 is a deficient number, since it is larger than the sum of its proper divisors (70239787319).

642051007081 is a wasteful number, since it uses less digits than its factorization.

642051007081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 989292839.

The product of its (nonzero) digits is 13440, while the sum is 34.

The spelling of 642051007081 in words is "six hundred forty-two billion, fifty-one million, seven thousand, eighty-one".