261545344760 has 64 divisors (see below), whose sum is σ = 712106665920. Its totient is φ = 84397824000.

The previous prime is 261545344757. The next prime is 261545344799. The reversal of 261545344760 is 67443545162.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27468491 + ... + 27478010.

It is an arithmetic number, because the mean of its divisors is an integer number (11126666655).

Almost surely, 2^261545344760 is an apocalyptic number.

261545344760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261545344760 is an abundant number, since it is smaller than the sum of its proper divisors (450561321160).

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

261545344760 is a wasteful number, since it uses less digits than its factorization.

261545344760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54946536 (or 54946532 counting only the distinct ones).

The product of its (nonzero) digits is 2419200, while the sum is 47.

The spelling of 261545344760 in words is "two hundred sixty-one billion, five hundred forty-five million, three hundred forty-four thousand, seven hundred sixty".