640150137 has 18 divisors (see below), whose sum is σ = 1016364986. Its totient is φ = 387969120.

The previous prime is 640150127. The next prime is 640150139. The reversal of 640150137 is 731051046.

640150137 is a `hidden beast` number, since 640 + 1 + 5 + 0 + 13 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 522991161 + 117158976 = 22869^2 + 10824^2 .

It is not a de Polignac number, because 640150137 - 2²² = 635955833 is a prime.

It is a super-2 number, since 2×640150137² = 819584395802237538, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 640150137.

It is not an unprimeable number, because it can be changed into a prime (640150139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 292828 + ... + 295005.

Almost surely, 2^640150137 is an apocalyptic number.

It is an amenable number.

640150137 is a deficient number, since it is larger than the sum of its proper divisors (376214849).

640150137 is a wasteful number, since it uses less digits than its factorization.

640150137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 587861 (or 587847 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 640150137 is about 25301.1884503475. The cubic root of 640150137 is about 861.8412583192.

Subtracting 640150137 from its reverse (731051046), we obtain a palindrome (90900909).

The spelling of 640150137 in words is "six hundred forty million, one hundred fifty thousand, one hundred thirty-seven".