642684071515 has 8 divisors (see below), whose sum is σ = 772893818928. Its totient is φ = 513031968480.

The previous prime is 642684071431. The next prime is 642684071539. The reversal of 642684071515 is 515170486246.

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

It is a de Polignac number, because none of the positive numbers 2^k-642684071515 is a prime.

It is a Duffinian 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, 139408557 + ... + 139413166.

It is an arithmetic number, because the mean of its divisors is an integer number (96611727366).

Almost surely, 2^642684071515 is an apocalyptic number.

642684071515 is a deficient number, since it is larger than the sum of its proper divisors (130209747413).

642684071515 is a wasteful number, since it uses less digits than its factorization.

642684071515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278822189.

The product of its (nonzero) digits is 1612800, while the sum is 49.

The spelling of 642684071515 in words is "six hundred forty-two billion, six hundred eighty-four million, seventy-one thousand, five hundred fifteen".