639682294050 has 162 divisors, whose sum is σ = 1768052562003. Its totient is φ = 165808745280.

The previous prime is 639682294037. The next prime is 639682294081. The reversal of 639682294050 is 50492286936.

It is a happy number.

639682294050 is a `hidden beast` number, since 6 + 3 + 9 + 6 + 8 + 229 + 405 + 0 = 666.

It can be written as a sum of positive squares in 5 ways, for example, as 507344222961 + 132338071089 = 712281^2 + 363783^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=565545.

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 627754441 + ... + 627755459.

Almost surely, 2^639682294050 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 639682294050

639682294050 is an abundant number, since it is smaller than the sum of its proper divisors (1128370267953).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

639682294050 is a wasteful number, since it uses less digits than its factorization.

639682294050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2130 (or 1066 counting only the distinct ones).

The product of its (nonzero) digits is 5598720, while the sum is 54.

The spelling of 639682294050 in words is "six hundred thirty-nine billion, six hundred eighty-two million, two hundred ninety-four thousand, fifty".