261779038152 has 32 divisors (see below), whose sum is σ = 654584539200. Its totient is φ = 87241420224.

The previous prime is 261779038151. The next prime is 261779038159. The reversal of 261779038152 is 251830977162.

It is a junction number, because it is equal to n+sod(n) for n = 261779038095 and 261779038104.

It is not an unprimeable number, because it can be changed into a prime (261779038151) 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, 1023868 + ... + 1253739.

It is an arithmetic number, because the mean of its divisors is an integer number (20455766850).

Almost surely, 2^261779038152 is an apocalyptic number.

It is an amenable number.

261779038152 is an abundant number, since it is smaller than the sum of its proper divisors (392805501048).

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

261779038152 is a wasteful number, since it uses less digits than its factorization.

261779038152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2282405 (or 2282401 counting only the distinct ones).

The product of its (nonzero) digits is 1270080, while the sum is 51.

The spelling of 261779038152 in words is "two hundred sixty-one billion, seven hundred seventy-nine million, thirty-eight thousand, one hundred fifty-two".