261421774634132 has 48 divisors (see below), whose sum is σ = 525571492454400. Its totient is φ = 111453559712352.

The previous prime is 261421774634101. The next prime is 261421774634171. The reversal of 261421774634132 is 231436477124162.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24636893 + ... + 33612795.

It is an arithmetic number, because the mean of its divisors is an integer number (10949406092800).

Almost surely, 2^{261421774634132} is an apocalyptic number.

It is an amenable number.

261421774634132 is an abundant number, since it is smaller than the sum of its proper divisors (264149717820268).

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

261421774634132 is a wasteful number, since it uses less digits than its factorization.

261421774634132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8981340 (or 8981338 counting only the distinct ones).

The product of its digits is 8128512, while the sum is 53.

The spelling of 261421774634132 in words is "two hundred sixty-one trillion, four hundred twenty-one billion, seven hundred seventy-four million, six hundred thirty-four thousand, one hundred thirty-two".