261894262022520 has 64 divisors (see below), whose sum is σ = 790072075440000. Its totient is φ = 69448310817408.

The previous prime is 261894262022513. The next prime is 261894262022531. The reversal of 261894262022520 is 25220262498162.

It is a super-3 number, since 3×261894262022520³ (a number of 44 digits) contains 333 as substring.

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, 6096213670 + ... + 6096256629.

It is an arithmetic number, because the mean of its divisors is an integer number (12344876178750).

Almost surely, 2^{261894262022520} is an apocalyptic number.

261894262022520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261894262022520 is an abundant number, since it is smaller than the sum of its proper divisors (528177813417480).

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

261894262022520 is a wasteful number, since it uses less digits than its factorization.

261894262022520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12192470492 (or 12192470488 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 51.

The spelling of 261894262022520 in words is "two hundred sixty-one trillion, eight hundred ninety-four billion, two hundred sixty-two million, twenty-two thousand, five hundred twenty".