261440036464404 has 144 divisors (see below), whose sum is σ = 728822249695232. Its totient is φ = 71447586065856.

The previous prime is 261440036464391. The next prime is 261440036464417. The reversal of 261440036464404 is 404464630044162.

It is an interprime number because it is at equal distance from previous prime (261440036464391) and next prime (261440036464417).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3257251977 + ... + 3257332239.

Almost surely, 2^{261440036464404} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261440036464404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (364411124847616).

261440036464404 is an abundant number, since it is smaller than the sum of its proper divisors (467382213230828).

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

261440036464404 is a wasteful number, since it uses less digits than its factorization.

261440036464404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153626 (or 153601 counting only the distinct ones).

The product of its (nonzero) digits is 5308416, while the sum is 48.

The spelling of 261440036464404 in words is "two hundred sixty-one trillion, four hundred forty billion, thirty-six million, four hundred sixty-four thousand, four hundred four".