640043358766 has 16 divisors (see below), whose sum is σ = 1097230629600. Its totient is φ = 274300935840.

The previous prime is 640043358733. The next prime is 640043358767. The reversal of 640043358766 is 667853340046.

It is a super-2 number, since 2×640043358766² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640043358767) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1158060 + ... + 1619008.

It is an arithmetic number, because the mean of its divisors is an integer number (68576914350).

Almost surely, 2^640043358766 is an apocalyptic number.

640043358766 is a deficient number, since it is larger than the sum of its proper divisors (457187270834).

640043358766 is a wasteful number, since it uses less digits than its factorization.

640043358766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560139.

The product of its (nonzero) digits is 8709120, while the sum is 52.

The spelling of 640043358766 in words is "six hundred forty billion, forty-three million, three hundred fifty-eight thousand, seven hundred sixty-six".