642426151615 has 8 divisors (see below), whose sum is σ = 770919122160. Its totient is φ = 513935761152.

The previous prime is 642426151603. The next prime is 642426151621. The reversal of 642426151615 is 516151624246.

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 642426151615 - 2¹¹ = 642426149567 is a prime.

It is a super-2 number, since 2×642426151615² (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 7 ways as a sum of consecutive naturals, for example, 46789 + ... + 1134478.

It is an arithmetic number, because the mean of its divisors is an integer number (96364890270).

Almost surely, 2^642426151615 is an apocalyptic number.

642426151615 is a deficient number, since it is larger than the sum of its proper divisors (128492970545).

642426151615 is a wasteful number, since it uses less digits than its factorization.

642426151615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1290041.

The product of its digits is 345600, while the sum is 43.

The spelling of 642426151615 in words is "six hundred forty-two billion, four hundred twenty-six million, one hundred fifty-one thousand, six hundred fifteen".