261543631345410 has 128 divisors (see below), whose sum is σ = 642057065717760. Its totient is φ = 68168299680000.

The previous prime is 261543631345343. The next prime is 261543631345421. The reversal of 261543631345410 is 14543136345162.

It is a self number, because there is not a number n which added to its sum of digits gives 261543631345410.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1400460499 + ... + 1400647241.

It is an arithmetic number, because the mean of its divisors is an integer number (5016070825920).

Almost surely, 2^{261543631345410} is an apocalyptic number.

261543631345410 is an abundant number, since it is smaller than the sum of its proper divisors (380513434372350).

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

261543631345410 is a wasteful number, since it uses less digits than its factorization.

261543631345410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192784.

The product of its (nonzero) digits is 3110400, while the sum is 48.

The spelling of 261543631345410 in words is "two hundred sixty-one trillion, five hundred forty-three billion, six hundred thirty-one million, three hundred forty-five thousand, four hundred ten".