642227864725 has 6 divisors (see below), whose sum is σ = 796362552290. Its totient is φ = 513782291760.

The previous prime is 642227864699. The next prime is 642227864737. The reversal of 642227864725 is 527468722246.

It can be written as a sum of positive squares in 3 ways, for example, as 380133009 + 641847731716 = 19497^2 + 801154^2 .

It is not a de Polignac number, because 642227864725 - 2¹³ = 642227856533 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12844557270 + ... + 12844557319.

Almost surely, 2^642227864725 is an apocalyptic number.

It is an amenable number.

642227864725 is a deficient number, since it is larger than the sum of its proper divisors (154134687565).

642227864725 is a wasteful number, since it uses less digits than its factorization.

642227864725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25689114599 (or 25689114594 counting only the distinct ones).

The product of its digits is 18063360, while the sum is 55.

The spelling of 642227864725 in words is "six hundred forty-two billion, two hundred twenty-seven million, eight hundred sixty-four thousand, seven hundred twenty-five".