261797928120 has 128 divisors (see below), whose sum is σ = 893944296000. Its totient is φ = 68110018560.

The previous prime is 261797928113. The next prime is 261797928181. The reversal of 261797928120 is 21829797162.

261797928120 is a `hidden beast` number, since 2 + 617 + 9 + 7 + 9 + 2 + 8 + 12 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2911885 + ... + 3000444.

Almost surely, 2^261797928120 is an apocalyptic number.

261797928120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261797928120 is an abundant number, since it is smaller than the sum of its proper divisors (632146367880).

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

261797928120 is a wasteful number, since it uses less digits than its factorization.

261797928120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5912390 (or 5912380 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 54.

The spelling of 261797928120 in words is "two hundred sixty-one billion, seven hundred ninety-seven million, nine hundred twenty-eight thousand, one hundred twenty".