261564213601124 has 24 divisors (see below), whose sum is σ = 523131932917440. Its totient is φ = 112098197461536.

The previous prime is 261564213601123. The next prime is 261564213601181. The reversal of 261564213601124 is 421106312465162.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (261564213601123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27038027 + ... + 35414450.

It is an arithmetic number, because the mean of its divisors is an integer number (21797163871560).

Almost surely, 2^{261564213601124} is an apocalyptic number.

It is an amenable number.

261564213601124 is an abundant number, since it is smaller than the sum of its proper divisors (261567719316316).

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

261564213601124 is a wasteful number, since it uses less digits than its factorization.

261564213601124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62602067 (or 62602065 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 44.

The spelling of 261564213601124 in words is "two hundred sixty-one trillion, five hundred sixty-four billion, two hundred thirteen million, six hundred one thousand, one hundred twenty-four".