642462168025 has 6 divisors (see below), whose sum is σ = 796653088382. Its totient is φ = 513969734400.

The previous prime is 642462167983. The next prime is 642462168071. The reversal of 642462168025 is 520861264246.

It can be written as a sum of positive squares in 3 ways, for example, as 31668337936 + 610793830089 = 177956^2 + 781533^2 .

It is not a de Polignac number, because 642462168025 - 2¹¹ = 642462165977 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12849243336 + ... + 12849243385.

Almost surely, 2^642462168025 is an apocalyptic number.

It is an amenable number.

642462168025 is a deficient number, since it is larger than the sum of its proper divisors (154190920357).

642462168025 is a wasteful number, since it uses less digits than its factorization.

642462168025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25698486731 (or 25698486726 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 46.

The spelling of 642462168025 in words is "six hundred forty-two billion, four hundred sixty-two million, one hundred sixty-eight thousand, twenty-five".