261047421184 has 81 divisors (see below), whose sum is σ = 572949362419. Its totient is φ = 118617044480.

The previous prime is 261047421157. The next prime is 261047421191. The reversal of 261047421184 is 481124740162.

It is a happy number.

The square root of 261047421184 is 510928.

It is a perfect power (a square), and thus also a powerful number.

It is a super-2 number, since 2×261047421184² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 89921877 + ... + 89924779.

Almost surely, 2^261047421184 is an apocalyptic number.

261047421184 is the 510928-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261047421184

261047421184 is an abundant number, since it is smaller than the sum of its proper divisors (311901941235).

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

261047421184 is an frugal number, since it uses more digits than its factorization.

261047421184 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5844 (or 2916 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 40.

The spelling of 261047421184 in words is "two hundred sixty-one billion, forty-seven million, four hundred twenty-one thousand, one hundred eighty-four".