639225515451 has 16 divisors (see below), whose sum is σ = 855764155008. Its totient is φ = 424418880000.

The previous prime is 639225515447. The next prime is 639225515483. The reversal of 639225515451 is 154515522936.

It is not a de Polignac number, because 639225515451 - 2² = 639225515447 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 639225515451.

It is not an unprimeable number, because it can be changed into a prime (639225515651) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 12633435 + ... + 12683931.

It is an arithmetic number, because the mean of its divisors is an integer number (53485259688).

Almost surely, 2^639225515451 is an apocalyptic number.

639225515451 is a deficient number, since it is larger than the sum of its proper divisors (216538639557).

639225515451 is a wasteful number, since it uses less digits than its factorization.

639225515451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67562.

The product of its digits is 1620000, while the sum is 48.

The spelling of 639225515451 in words is "six hundred thirty-nine billion, two hundred twenty-five million, five hundred fifteen thousand, four hundred fifty-one".