261011156392 has 32 divisors (see below), whose sum is σ = 559578640320. Its totient is φ = 111808120320.

The previous prime is 261011156353. The next prime is 261011156569. The reversal of 261011156392 is 293651110162.

It is a super-2 number, since 2×261011156392² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1003338 + ... + 1236409.

It is an arithmetic number, because the mean of its divisors is an integer number (17486832510).

Almost surely, 2^261011156392 is an apocalyptic number.

It is an amenable number.

261011156392 is an abundant number, since it is smaller than the sum of its proper divisors (298567483928).

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

261011156392 is a wasteful number, since it uses less digits than its factorization.

261011156392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2241841 (or 2241837 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 37.

The spelling of 261011156392 in words is "two hundred sixty-one billion, eleven million, one hundred fifty-six thousand, three hundred ninety-two".