639225515450 has 12 divisors (see below), whose sum is σ = 1188959458830. Its totient is φ = 255690206160.

The previous prime is 639225515447. The next prime is 639225515483. The reversal of 639225515450 is 54515522936.

It can be written as a sum of positive squares in 3 ways, for example, as 282036407041 + 357189108409 = 531071^2 + 597653^2 .

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 639225515395 and 639225515404.

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, 6392255105 + ... + 6392255204.

Almost surely, 2^639225515450 is an apocalyptic number.

639225515450 is a deficient number, since it is larger than the sum of its proper divisors (549733943380).

639225515450 is a wasteful number, since it uses less digits than its factorization.

639225515450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12784510321 (or 12784510316 counting only the distinct ones).

The product of its (nonzero) digits is 1620000, while the sum is 47.

The spelling of 639225515450 in words is "six hundred thirty-nine billion, two hundred twenty-five million, five hundred fifteen thousand, four hundred fifty".