261535122407312 has 80 divisors (see below), whose sum is σ = 590096960877312. Its totient is φ = 111190825052160.

The previous prime is 261535122407311. The next prime is 261535122407347. The reversal of 261535122407312 is 213704221535162.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (261535122407311) 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, 786680114 + ... + 787012497.

Almost surely, 2^{261535122407312} is an apocalyptic number.

It is an amenable number.

261535122407312 is an abundant number, since it is smaller than the sum of its proper divisors (328561838470000).

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

261535122407312 is a wasteful number, since it uses less digits than its factorization.

261535122407312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1573692696 (or 1573692690 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 44.

The spelling of 261535122407312 in words is "two hundred sixty-one trillion, five hundred thirty-five billion, one hundred twenty-two million, four hundred seven thousand, three hundred twelve".