261586260857 has 16 divisors (see below), whose sum is σ = 263079187200. Its totient is φ = 260099631168.

The previous prime is 261586260809. The next prime is 261586260883. The reversal of 261586260857 is 758062685162.

It is a cyclic number.

It is not a de Polignac number, because 261586260857 - 2²⁴ = 261569483641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261586260757) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 262372883 + ... + 262373879.

It is an arithmetic number, because the mean of its divisors is an integer number (16442449200).

Almost surely, 2^261586260857 is an apocalyptic number.

It is an amenable number.

261586260857 is a deficient number, since it is larger than the sum of its proper divisors (1492926343).

261586260857 is an equidigital number, since it uses as much as digits as its factorization.

261586260857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2920.

The product of its (nonzero) digits is 9676800, while the sum is 56.

The spelling of 261586260857 in words is "two hundred sixty-one billion, five hundred eighty-six million, two hundred sixty thousand, eight hundred fifty-seven".