642621526415 has 16 divisors (see below), whose sum is σ = 841371559200. Its totient is φ = 467293576320.

The previous prime is 642621526399. The next prime is 642621526427. The reversal of 642621526415 is 514625126246.

It is not a de Polignac number, because 642621526415 - 2⁴ = 642621526399 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 458504 + ... + 1222893.

It is an arithmetic number, because the mean of its divisors is an integer number (52585722450).

Almost surely, 2^642621526415 is an apocalyptic number.

642621526415 is a deficient number, since it is larger than the sum of its proper divisors (198750032785).

642621526415 is a wasteful number, since it uses less digits than its factorization.

642621526415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1688362.

The product of its digits is 691200, while the sum is 44.

The spelling of 642621526415 in words is "six hundred forty-two billion, six hundred twenty-one million, five hundred twenty-six thousand, four hundred fifteen".