261922329456 has 40 divisors (see below), whose sum is σ = 699964849680. Its totient is φ = 84296841216.

The previous prime is 261922329443. The next prime is 261922329457. The reversal of 261922329456 is 654923229162.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 261922329399 and 261922329408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261922329457) 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, 94079905 + ... + 94082688.

It is an arithmetic number, because the mean of its divisors is an integer number (17499121242).

Almost surely, 2^261922329456 is an apocalyptic number.

It is an amenable number.

261922329456 is an abundant number, since it is smaller than the sum of its proper divisors (438042520224).

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

261922329456 is a wasteful number, since it uses less digits than its factorization.

261922329456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188162633 (or 188162627 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 51.

The spelling of 261922329456 in words is "two hundred sixty-one billion, nine hundred twenty-two million, three hundred twenty-nine thousand, four hundred fifty-six".