261421716507364 has 24 divisors (see below), whose sum is σ = 524121778839680. Its totient is φ = 111763947254976.

The previous prime is 261421716507361. The next prime is 261421716507373. The reversal of 261421716507364 is 463705617124162.

It is not an unprimeable number, because it can be changed into a prime (261421716507361) 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, 11413790352 + ... + 11413813255.

Almost surely, 2^{261421716507364} is an apocalyptic number.

It is an amenable number.

261421716507364 is an abundant number, since it is smaller than the sum of its proper divisors (262700062332316).

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

261421716507364 is a wasteful number, since it uses less digits than its factorization.

261421716507364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22827604027 (or 22827604025 counting only the distinct ones).

The product of its (nonzero) digits is 10160640, while the sum is 55.

The spelling of 261421716507364 in words is "two hundred sixty-one trillion, four hundred twenty-one billion, seven hundred sixteen million, five hundred seven thousand, three hundred sixty-four".