640494437130 has 40 divisors (see below), whose sum is σ = 1722218377572. Its totient is φ = 170798516352.

The previous prime is 640494437113. The next prime is 640494437147. The reversal of 640494437130 is 31734494046.

640494437130 is a `hidden beast` number, since 6 + 40 + 49 + 4 + 437 + 130 = 666.

It is an interprime number because it is at equal distance from previous prime (640494437113) and next prime (640494437147).

It can be written as a sum of positive squares in 2 ways, for example, as 518283366561 + 122211070569 = 719919^2 + 349587^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 395366127 + ... + 395367746.

Almost surely, 2^640494437130 is an apocalyptic number.

640494437130 is an abundant number, since it is smaller than the sum of its proper divisors (1081723940442).

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

640494437130 is a wasteful number, since it uses less digits than its factorization.

640494437130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 790733892 (or 790733883 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 45.

The spelling of 640494437130 in words is "six hundred forty billion, four hundred ninety-four million, four hundred thirty-seven thousand, one hundred thirty".