642537404622671 has 8 divisors (see below), whose sum is σ = 657544886601984. Its totient is φ = 627585609033880.

The previous prime is 642537404622653. The next prime is 642537404622683. The reversal of 642537404622671 is 176226404735246.

It is a happy number.

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 642537404622671 - 2²⁶ = 642537337513807 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 642537404622671.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642537404622691) 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, 13921574285 + ... + 13921620438.

It is an arithmetic number, because the mean of its divisors is an integer number (82193110825248).

Almost surely, 2^{642537404622671} is an apocalyptic number.

642537404622671 is a deficient number, since it is larger than the sum of its proper divisors (15007481979313).

642537404622671 is a wasteful number, since it uses less digits than its factorization.

642537404622671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27843195261.

The product of its (nonzero) digits is 81285120, while the sum is 59.

The spelling of 642537404622671 in words is "six hundred forty-two trillion, five hundred thirty-seven billion, four hundred four million, six hundred twenty-two thousand, six hundred seventy-one".