261403410884 has 48 divisors (see below), whose sum is σ = 581095783296. Its totient is φ = 99923865600.

The previous prime is 261403410871. The next prime is 261403410889. The reversal of 261403410884 is 488014304162.

It is a super-2 number, since 2×261403410884² (a number of 24 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (261403410889) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7990397 + ... + 8023044.

It is an arithmetic number, because the mean of its divisors is an integer number (12106162152).

Almost surely, 2^261403410884 is an apocalyptic number.

It is an amenable number.

261403410884 is an abundant number, since it is smaller than the sum of its proper divisors (319692372412).

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

261403410884 is a wasteful number, since it uses less digits than its factorization.

261403410884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16013516 (or 16013514 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 41.

The spelling of 261403410884 in words is "two hundred sixty-one billion, four hundred three million, four hundred ten thousand, eight hundred eighty-four".