640584798170 has 16 divisors (see below), whose sum is σ = 1157646476448. Its totient is φ = 255213066000.

The previous prime is 640584798169. The next prime is 640584798197. The reversal of 640584798170 is 71897485046.

It is a super-3 number, since 3×640584798170³ (a number of 36 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127604024 + ... + 127609043.

It is an arithmetic number, because the mean of its divisors is an integer number (72352904778).

Almost surely, 2^640584798170 is an apocalyptic number.

640584798170 is a deficient number, since it is larger than the sum of its proper divisors (517061678278).

640584798170 is a wasteful number, since it uses less digits than its factorization.

640584798170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255213325.

The product of its (nonzero) digits is 13547520, while the sum is 59.

The spelling of 640584798170 in words is "six hundred forty billion, five hundred eighty-four million, seven hundred ninety-eight thousand, one hundred seventy".