261181250604 has 120 divisors (see below), whose sum is σ = 716049734400. Its totient is φ = 82856242656.

The previous prime is 261181250599. The next prime is 261181250621. The reversal of 261181250604 is 406052181162.

It is a happy number.

261181250604 is a `hidden beast` number, since 26 + 1 + 1 + 8 + 1 + 25 + 0 + 604 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1394887 + ... + 1571009.

It is an arithmetic number, because the mean of its divisors is an integer number (5967081120).

Almost surely, 2^261181250604 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 261181250604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (358024867200).

261181250604 is an abundant number, since it is smaller than the sum of its proper divisors (454868483796).

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

261181250604 is a wasteful number, since it uses less digits than its factorization.

261181250604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176361 (or 176350 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The spelling of 261181250604 in words is "two hundred sixty-one billion, one hundred eighty-one million, two hundred fifty thousand, six hundred four".