261421052511750 has 64 divisors (see below), whose sum is σ = 652560440942592. Its totient is φ = 69706565512800.

The previous prime is 261421052511737. The next prime is 261421052511779. The reversal of 261421052511750 is 57115250124162.

It is a happy number.

261421052511750 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5129542 + ... + 23434041.

It is an arithmetic number, because the mean of its divisors is an integer number (10196256889728).

Almost surely, 2^{261421052511750} is an apocalyptic number.

261421052511750 is an abundant number, since it is smaller than the sum of its proper divisors (391139388430842).

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

261421052511750 is a wasteful number, since it uses less digits than its factorization.

261421052511750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28575806 (or 28575796 counting only the distinct ones).

The product of its (nonzero) digits is 168000, while the sum is 42.

The spelling of 261421052511750 in words is "two hundred sixty-one trillion, four hundred twenty-one billion, fifty-two million, five hundred eleven thousand, seven hundred fifty".