261115406475 has 96 divisors (see below), whose sum is σ = 538400730624. Its totient is φ = 108482457600.

The previous prime is 261115406473. The next prime is 261115406483. The reversal of 261115406475 is 574604511162.

It is not a de Polignac number, because 261115406475 - 2¹ = 261115406473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261115406471) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 31255899 + ... + 31264251.

It is an arithmetic number, because the mean of its divisors is an integer number (5608340944).

Almost surely, 2^261115406475 is an apocalyptic number.

261115406475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

261115406475 is an abundant number, since it is smaller than the sum of its proper divisors (277285324149).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261115406475 is a wasteful number, since it uses less digits than its factorization.

261115406475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13797 (or 13792 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 42.

It can be divided in two parts, 261115 and 406475, that added together give a triangular number (667590 = T₁₁₅₅).

The spelling of 261115406475 in words is "two hundred sixty-one billion, one hundred fifteen million, four hundred six thousand, four hundred seventy-five".