261676064570557 has 64 divisors (see below), whose sum is σ = 349963054930944. Its totient is φ = 189806251069440.

The previous prime is 261676064570449. The next prime is 261676064570603. The reversal of 261676064570557 is 755075460676162.

It is not a de Polignac number, because 261676064570557 - 2²³ = 261676056181949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 261676064570492 and 261676064570501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261676064570357) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3741178 + ... + 23180779.

It is an arithmetic number, because the mean of its divisors is an integer number (5468172733296).

Almost surely, 2^{261676064570557} is an apocalyptic number.

It is an amenable number.

261676064570557 is a deficient number, since it is larger than the sum of its proper divisors (88286990360387).

261676064570557 is a wasteful number, since it uses less digits than its factorization.

261676064570557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26922158.

The product of its (nonzero) digits is 444528000, while the sum is 67.

The spelling of 261676064570557 in words is "two hundred sixty-one trillion, six hundred seventy-six billion, sixty-four million, five hundred seventy thousand, five hundred fifty-seven".