640765716078 has 16 divisors (see below), whose sum is σ = 1283622029136. Its totient is φ = 213240139200.

The previous prime is 640765716047. The next prime is 640765716089. The reversal of 640765716078 is 870617567046.

640765716078 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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, 87104223 + ... + 87111578.

It is an arithmetic number, because the mean of its divisors is an integer number (80226376821).

Almost surely, 2^640765716078 is an apocalyptic number.

640765716078 is an abundant number, since it is smaller than the sum of its proper divisors (642856313058).

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

640765716078 is a wasteful number, since it uses less digits than its factorization.

640765716078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174216419.

The product of its (nonzero) digits is 11854080, while the sum is 57.

The spelling of 640765716078 in words is "six hundred forty billion, seven hundred sixty-five million, seven hundred sixteen thousand, seventy-eight".