261421660403252 has 12 divisors (see below), whose sum is σ = 457489519524576. Its totient is φ = 130710369110520.

The previous prime is 261421660403213. The next prime is 261421660403257. The reversal of 261421660403252 is 252304066124162.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261421660403257) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113995538 + ... + 116266185.

It is an arithmetic number, because the mean of its divisors is an integer number (38124126627048).

Almost surely, 2^{261421660403252} is an apocalyptic number.

It is an amenable number.

261421660403252 is a deficient number, since it is larger than the sum of its proper divisors (196067859121324).

261421660403252 is a wasteful number, since it uses less digits than its factorization.

261421660403252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230545558 (or 230545556 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 44.

The spelling of 261421660403252 in words is "two hundred sixty-one trillion, four hundred twenty-one billion, six hundred sixty million, four hundred three thousand, two hundred fifty-two".