261438587062005 has 32 divisors (see below), whose sum is σ = 418571609234688. Its totient is φ = 139343960448000.

The previous prime is 261438587061959. The next prime is 261438587062033. The reversal of 261438587062005 is 500260785834162.

It is not a de Polignac number, because 261438587062005 - 2⁷ = 261438587061877 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1366681965 + ... + 1366873245.

It is an arithmetic number, because the mean of its divisors is an integer number (13080362788584).

Almost surely, 2^{261438587062005} is an apocalyptic number.

It is an amenable number.

261438587062005 is a deficient number, since it is larger than the sum of its proper divisors (157133022172683).

261438587062005 is a wasteful number, since it uses less digits than its factorization.

261438587062005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249597.

The product of its (nonzero) digits is 19353600, while the sum is 57.

The spelling of 261438587062005 in words is "two hundred sixty-one trillion, four hundred thirty-eight billion, five hundred eighty-seven million, sixty-two thousand, five".