261534253710620 has 96 divisors (see below), whose sum is σ = 599656755241152. Its totient is φ = 95023134720000.

The previous prime is 261534253710617. The next prime is 261534253710629. The reversal of 261534253710620 is 26017352435162.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261534253710629) 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, 2789324540 + ... + 2789418300.

It is an arithmetic number, because the mean of its divisors is an integer number (6246424533762).

Almost surely, 2^{261534253710620} is an apocalyptic number.

261534253710620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261534253710620 is an abundant number, since it is smaller than the sum of its proper divisors (338122501530532).

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

261534253710620 is a wasteful number, since it uses less digits than its factorization.

261534253710620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104343 (or 104341 counting only the distinct ones).

The product of its (nonzero) digits is 1814400, while the sum is 47.

The spelling of 261534253710620 in words is "two hundred sixty-one trillion, five hundred thirty-four billion, two hundred fifty-three million, seven hundred ten thousand, six hundred twenty".