261530054532600 has 384 divisors, whose sum is σ = 979087620096000. Its totient is φ = 56455452218880.

The previous prime is 261530054532599. The next prime is 261530054532667. The reversal of 261530054532600 is 6235450035162.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 9503730 + ... + 24766529.

It is an arithmetic number, because the mean of its divisors is an integer number (2549707344000).

Almost surely, 2^{261530054532600} is an apocalyptic number.

261530054532600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261530054532600 is an abundant number, since it is smaller than the sum of its proper divisors (717557565563400).

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

261530054532600 is a wasteful number, since it uses less digits than its factorization.

261530054532600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34270387 (or 34270378 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 42.

The spelling of 261530054532600 in words is "two hundred sixty-one trillion, five hundred thirty billion, fifty-four million, five hundred thirty-two thousand, six hundred".