261703767036213 has 24 divisors (see below), whose sum is σ = 379813826028728. Its totient is φ = 173641103505792.

The previous prime is 261703767036209. The next prime is 261703767036253. The reversal of 261703767036213 is 312630767307162.

261703767036213 is a `hidden beast` number, since 2 + 6 + 1 + 7 + 0 + 3 + 7 + 6 + 7 + 0 + 3 + 621 + 3 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 22907538137124 + 238796228899089 = 4786182^2 + 15453033^2 .

It is not a de Polignac number, because 261703767036213 - 2² = 261703767036209 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261703767036213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261703767036253) 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, 57662806 + ... + 62035527.

Almost surely, 2^{261703767036213} is an apocalyptic number.

It is an amenable number.

261703767036213 is a deficient number, since it is larger than the sum of its proper divisors (118110058992515).

261703767036213 is a wasteful number, since it uses less digits than its factorization.

261703767036213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119699493 (or 119699490 counting only the distinct ones).

The product of its (nonzero) digits is 8001504, while the sum is 54.

The spelling of 261703767036213 in words is "two hundred sixty-one trillion, seven hundred three billion, seven hundred sixty-seven million, thirty-six thousand, two hundred thirteen".