261105173196 has 48 divisors (see below), whose sum is σ = 710490278400. Its totient is φ = 74601476880.

The previous prime is 261105173149. The next prime is 261105173207. The reversal of 261105173196 is 691371501162.

It is a super-2 number, since 2×261105173196² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31714200 + ... + 31722431.

It is an arithmetic number, because the mean of its divisors is an integer number (14801880800).

Almost surely, 2^261105173196 is an apocalyptic number.

It is an amenable number.

261105173196 is an abundant number, since it is smaller than the sum of its proper divisors (449385105204).

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

261105173196 is a wasteful number, since it uses less digits than its factorization.

261105173196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63436659 (or 63436643 counting only the distinct ones).

The product of its (nonzero) digits is 68040, while the sum is 42.

The spelling of 261105173196 in words is "two hundred sixty-one billion, one hundred five million, one hundred seventy-three thousand, one hundred ninety-six".