640770107376973 has 12 divisors (see below), whose sum is σ = 789231848943132. Its totient is φ = 516923784101760.

The previous prime is 640770107376961. The next prime is 640770107377009. The reversal of 640770107376973 is 379673701077046.

It can be written as a sum of positive squares in 2 ways, for example, as 537188255091684 + 103581852285289 = 23177322^2 + 10177517^2 .

It is not a de Polignac number, because 640770107376973 - 2⁴⁵ = 605585735288141 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 640770107376899 and 640770107376908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640770107376923) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 384615909958 + ... + 384615911623.

It is an arithmetic number, because the mean of its divisors is an integer number (65769320745261).

Almost surely, 2^{640770107376973} is an apocalyptic number.

It is an amenable number.

640770107376973 is a deficient number, since it is larger than the sum of its proper divisors (148461741566159).

640770107376973 is a wasteful number, since it uses less digits than its factorization.

640770107376973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 769231821612 (or 769231821605 counting only the distinct ones).

The product of its (nonzero) digits is 196036848, while the sum is 67.

The spelling of 640770107376973 in words is "six hundred forty trillion, seven hundred seventy billion, one hundred seven million, three hundred seventy-six thousand, nine hundred seventy-three".