261908583053 has 4 divisors (see below), whose sum is σ = 282055397148. Its totient is φ = 241761768960.

The previous prime is 261908583037. The next prime is 261908583089. The reversal of 261908583053 is 350385809162.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 30299320489 + 231609262564 = 174067^2 + 481258^2 .

It is a cyclic number.

It is not a de Polignac number, because 261908583053 - 2⁴ = 261908583037 is a prime.

It is a super-2 number, since 2×261908583053² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 261908582992 and 261908583010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261908583953) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10073407028 + ... + 10073407053.

It is an arithmetic number, because the mean of its divisors is an integer number (70513849287).

Almost surely, 2^261908583053 is an apocalyptic number.

It is an amenable number.

261908583053 is a deficient number, since it is larger than the sum of its proper divisors (20146814095).

261908583053 is a wasteful number, since it uses less digits than its factorization.

261908583053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20146814094.

The product of its (nonzero) digits is 1555200, while the sum is 50.

The spelling of 261908583053 in words is "two hundred sixty-one billion, nine hundred eight million, five hundred eighty-three thousand, fifty-three".