261107213850 has 360 divisors, whose sum is σ = 871183133568. Its totient is φ = 57755073600.

The previous prime is 261107213833. The next prime is 261107213867. The reversal of 261107213850 is 58312701162.

261107213850 is a `hidden beast` number, since 2 + 611 + 0 + 7 + 2 + 1 + 38 + 5 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (261107213833) and next prime (261107213867).

It is an unprimeable number.

It is a polite number, since it can be written in 179 ways as a sum of consecutive naturals, for example, 6130729 + ... + 6173171.

Almost surely, 2^261107213850 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261107213850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (435591566784).

261107213850 is an abundant number, since it is smaller than the sum of its proper divisors (610075919718).

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

261107213850 is a wasteful number, since it uses less digits than its factorization.

261107213850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42512 (or 42491 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The spelling of 261107213850 in words is "two hundred sixty-one billion, one hundred seven million, two hundred thirteen thousand, eight hundred fifty".