261504419199 has 16 divisors (see below), whose sum is σ = 353688529152. Its totient is φ = 171837998208.

The previous prime is 261504419191. The next prime is 261504419213. The reversal of 261504419199 is 991914405162.

It is not a de Polignac number, because 261504419199 - 2³ = 261504419191 is a prime.

It is a super-2 number, since 2×261504419199² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261504419191) 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, 1104907 + ... + 1320540.

It is an arithmetic number, because the mean of its divisors is an integer number (22105533072).

Almost surely, 2^261504419199 is an apocalyptic number.

261504419199 is a deficient number, since it is larger than the sum of its proper divisors (92184109953).

261504419199 is a wasteful number, since it uses less digits than its factorization.

261504419199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2425966.

The product of its (nonzero) digits is 699840, while the sum is 51.

The spelling of 261504419199 in words is "two hundred sixty-one billion, five hundred four million, four hundred nineteen thousand, one hundred ninety-nine".