642525065456 has 10 divisors (see below), whose sum is σ = 1244892314352. Its totient is φ = 321262532720.

The previous prime is 642525065449. The next prime is 642525065491. The reversal of 642525065456 is 654560525246.

642525065456 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20078908280 + ... + 20078908311.

Almost surely, 2^642525065456 is an apocalyptic number.

It is an amenable number.

642525065456 is a deficient number, since it is larger than the sum of its proper divisors (602367248896).

642525065456 is a wasteful number, since it uses less digits than its factorization.

642525065456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40157816599 (or 40157816593 counting only the distinct ones).

The product of its (nonzero) digits is 8640000, while the sum is 50.

The spelling of 642525065456 in words is "six hundred forty-two billion, five hundred twenty-five million, sixty-five thousand, four hundred fifty-six".