261978582334 has 16 divisors (see below), whose sum is σ = 451033640928. Its totient is φ = 111794660352.

The previous prime is 261978582323. The next prime is 261978582347. The reversal of 261978582334 is 433285879162.

It is a happy number.

It is a super-3 number, since 3×261978582334³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

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, 40152867 + ... + 40159390.

It is an arithmetic number, because the mean of its divisors is an integer number (28189602558).

Almost surely, 2^261978582334 is an apocalyptic number.

261978582334 is a deficient number, since it is larger than the sum of its proper divisors (189055058594).

261978582334 is a wasteful number, since it uses less digits than its factorization.

261978582334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80312499.

The product of its digits is 17418240, while the sum is 58.

The spelling of 261978582334 in words is "two hundred sixty-one billion, nine hundred seventy-eight million, five hundred eighty-two thousand, three hundred thirty-four".