213791868765 has 24 divisors (see below), whose sum is σ = 370705659480. Its totient is φ = 113981380224.

The previous prime is 213791868737. The next prime is 213791868769. The reversal of 213791868765 is 567868197312.

213791868765 is a `hidden beast` number, since 2 + 1 + 379 + 186 + 87 + 6 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 43769242521 + 170022626244 = 209211^2 + 412338^2 .

It is not a de Polignac number, because 213791868765 - 2⁷ = 213791868637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213791868769) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 726222 + ... + 977231.

It is an arithmetic number, because the mean of its divisors is an integer number (15446069145).

Almost surely, 2^213791868765 is an apocalyptic number.

It is an amenable number.

213791868765 is a deficient number, since it is larger than the sum of its proper divisors (156913790715).

213791868765 is a wasteful number, since it uses less digits than its factorization.

213791868765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1706253 (or 1706250 counting only the distinct ones).

The product of its digits is 30481920, while the sum is 63.

The spelling of 213791868765 in words is "two hundred thirteen billion, seven hundred ninety-one million, eight hundred sixty-eight thousand, seven hundred sixty-five".