640577274650 has 12 divisors (see below), whose sum is σ = 1191473730942. Its totient is φ = 256230909840.

The previous prime is 640577274641. The next prime is 640577274661. The reversal of 640577274650 is 56472775046.

It can be written as a sum of positive squares in 3 ways, for example, as 249861019321 + 390716255329 = 499861^2 + 625073^2 .

It is a junction number, because it is equal to n+sod(n) for n = 640577274592 and 640577274601.

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, 6405772697 + ... + 6405772796.

Almost surely, 2^640577274650 is an apocalyptic number.

640577274650 is a deficient number, since it is larger than the sum of its proper divisors (550896456292).

640577274650 is a wasteful number, since it uses less digits than its factorization.

640577274650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12811545505 (or 12811545500 counting only the distinct ones).

The product of its (nonzero) digits is 9878400, while the sum is 53.

The spelling of 640577274650 in words is "six hundred forty billion, five hundred seventy-seven million, two hundred seventy-four thousand, six hundred fifty".