261306357560 has 32 divisors (see below), whose sum is σ = 590399323200. Its totient is φ = 104085206400.

The previous prime is 261306357523. The next prime is 261306357569. The reversal of 261306357560 is 65753603162.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261306357569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13657091 + ... + 13676210.

It is an arithmetic number, because the mean of its divisors is an integer number (18449978850).

Almost surely, 2^261306357560 is an apocalyptic number.

261306357560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261306357560 is an abundant number, since it is smaller than the sum of its proper divisors (329092965640).

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

261306357560 is a wasteful number, since it uses less digits than its factorization.

261306357560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27333551 (or 27333547 counting only the distinct ones).

The product of its (nonzero) digits is 680400, while the sum is 44.

The spelling of 261306357560 in words is "two hundred sixty-one billion, three hundred six million, three hundred fifty-seven thousand, five hundred sixty".