642463455626 has 16 divisors (see below), whose sum is σ = 1022953391496. Its totient is φ = 301574186496.

The previous prime is 642463455509. The next prime is 642463455637. The reversal of 642463455626 is 626554364246.

642463455626 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 553983978601 + 88479477025 = 744301^2 + 297455^2 .

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, 23784971 + ... + 23811966.

Almost surely, 2^642463455626 is an apocalyptic number.

642463455626 is a deficient number, since it is larger than the sum of its proper divisors (380489935870).

642463455626 is a wasteful number, since it uses less digits than its factorization.

642463455626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47597353.

The product of its digits is 24883200, while the sum is 53.

The spelling of 642463455626 in words is "six hundred forty-two billion, four hundred sixty-three million, four hundred fifty-five thousand, six hundred twenty-six".