261533466005172 has 48 divisors (see below), whose sum is σ = 646355530779840. Its totient is φ = 82022536852992.

The previous prime is 261533466005167. The next prime is 261533466005173. The reversal of 261533466005172 is 271500664335162.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261533466005173) 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, 211710523 + ... + 212942274.

It is an arithmetic number, because the mean of its divisors is an integer number (13465740224580).

Almost surely, 2^{261533466005172} is an apocalyptic number.

It is an amenable number.

261533466005172 is an abundant number, since it is smaller than the sum of its proper divisors (384822064774668).

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

261533466005172 is a wasteful number, since it uses less digits than its factorization.

261533466005172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424655840 (or 424655838 counting only the distinct ones).

The product of its (nonzero) digits is 5443200, while the sum is 51.

The spelling of 261533466005172 in words is "two hundred sixty-one trillion, five hundred thirty-three billion, four hundred sixty-six million, five thousand, one hundred seventy-two".