261432135167172 has 48 divisors (see below), whose sum is σ = 629809937078784. Its totient is φ = 84316348512000.

The previous prime is 261432135167149. The next prime is 261432135167249. The reversal of 261432135167172 is 271761531234162.

261432135167172 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×261432135167172² (a number of 30 digits) contains 22 as substring.

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, 67266979 + ... + 71047242.

It is an arithmetic number, because the mean of its divisors is an integer number (13121040355808).

Almost surely, 2^{261432135167172} is an apocalyptic number.

It is an amenable number.

261432135167172 is an abundant number, since it is smaller than the sum of its proper divisors (368377801911612).

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

261432135167172 is a wasteful number, since it uses less digits than its factorization.

261432135167172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138319340 (or 138319338 counting only the distinct ones).

The product of its digits is 2540160, while the sum is 51.

The spelling of 261432135167172 in words is "two hundred sixty-one trillion, four hundred thirty-two billion, one hundred thirty-five million, one hundred sixty-seven thousand, one hundred seventy-two".