261113679204 has 72 divisors (see below), whose sum is σ = 709315770240. Its totient is φ = 74542999104.

The previous prime is 261113679193. The next prime is 261113679209. The reversal of 261113679204 is 402976311162.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (261113679209) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 541989 + ... + 903315.

It is an arithmetic number, because the mean of its divisors is an integer number (9851607920).

Almost surely, 2^261113679204 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 261113679204, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (354657885120).

261113679204 is an abundant number, since it is smaller than the sum of its proper divisors (448202091036).

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

261113679204 is a wasteful number, since it uses less digits than its factorization.

261113679204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362577 (or 362568 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 42.

The spelling of 261113679204 in words is "two hundred sixty-one billion, one hundred thirteen million, six hundred seventy-nine thousand, two hundred four".