642500005245 has 24 divisors (see below), whose sum is σ = 1195836745824. Its totient is φ = 293714287776.

The previous prime is 642500005187. The next prime is 642500005271. The reversal of 642500005245 is 542500005246.

It is not a de Polignac number, because 642500005245 - 2¹² = 642500001149 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 437074099 + ... + 437075568.

It is an arithmetic number, because the mean of its divisors is an integer number (49826531076).

Almost surely, 2^642500005245 is an apocalyptic number.

It is an amenable number.

642500005245 is a deficient number, since it is larger than the sum of its proper divisors (553336740579).

642500005245 is a wasteful number, since it uses less digits than its factorization.

642500005245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 874149689 (or 874149682 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 33.

Subtracting from 642500005245 its reverse (542500005246), we obtain a palindrome (99999999999).

The spelling of 642500005245 in words is "six hundred forty-two billion, five hundred million, five thousand, two hundred forty-five".