261590570057 has 4 divisors (see below), whose sum is σ = 261758365440. Its totient is φ = 261422774676.

The previous prime is 261590570039. The next prime is 261590570099. The reversal of 261590570057 is 750075095162.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261590570057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261590569993 and 261590570020.

It is not an unprimeable number, because it can be changed into a prime (261590576057) 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, 83895353 + ... + 83898470.

It is an arithmetic number, because the mean of its divisors is an integer number (65439591360).

Almost surely, 2^261590570057 is an apocalyptic number.

It is an amenable number.

261590570057 is a deficient number, since it is larger than the sum of its proper divisors (167795383).

261590570057 is a wasteful number, since it uses less digits than its factorization.

261590570057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167795382.

The product of its (nonzero) digits is 661500, while the sum is 47.

The spelling of 261590570057 in words is "two hundred sixty-one billion, five hundred ninety million, five hundred seventy thousand, fifty-seven".