639953861618153 has 16 divisors (see below), whose sum is σ = 672876838847760. Its totient is φ = 607754675404800.

The previous prime is 639953861618131. The next prime is 639953861618161. The reversal of 639953861618153 is 351816168359936.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 103147037513689 + 536806824104464 = 10156133^2 + 23169092^2 .

It is a cyclic number.

It is not a de Polignac number, because 639953861618153 - 2⁶ = 639953861618089 is a prime.

It is a super-2 number, since 2×639953861618153² (a number of 30 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (639953861618353) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 531799001 + ... + 533001017.

It is an arithmetic number, because the mean of its divisors is an integer number (42054802427985).

Almost surely, 2^{639953861618153} is an apocalyptic number.

It is an amenable number.

639953861618153 is a deficient number, since it is larger than the sum of its proper divisors (32922977229607).

639953861618153 is a wasteful number, since it uses less digits than its factorization.

639953861618153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1503068.

The product of its digits is 755827200, while the sum is 74.

The spelling of 639953861618153 in words is "six hundred thirty-nine trillion, nine hundred fifty-three billion, eight hundred sixty-one million, six hundred eighteen thousand, one hundred fifty-three".