261443444460 has 96 divisors (see below), whose sum is σ = 798712717824. Its totient is φ = 63370560000.

The previous prime is 261443444413. The next prime is 261443444467. The reversal of 261443444460 is 64444344162.

It is a super-2 number, since 2×261443444460² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (261443444467) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4910985 + ... + 4963935.

It is an arithmetic number, because the mean of its divisors is an integer number (8319924144).

Almost surely, 2^261443444460 is an apocalyptic number.

261443444460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261443444460 is an abundant number, since it is smaller than the sum of its proper divisors (537269273364).

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

261443444460 is a wasteful number, since it uses less digits than its factorization.

261443444460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60455 (or 60453 counting only the distinct ones).

The product of its (nonzero) digits is 884736, while the sum is 42.

The spelling of 261443444460 in words is "two hundred sixty-one billion, four hundred forty-three million, four hundred forty-four thousand, four hundred sixty".