261376415850 has 192 divisors, whose sum is σ = 714399989760. Its totient is φ = 62716454400.

The previous prime is 261376415819. The next prime is 261376415899. The reversal of 261376415850 is 58514673162.

It is a self number, because there is not a number n which added to its sum of digits gives 261376415850.

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 95 ways as a sum of consecutive naturals, for example, 86575641 + ... + 86578659.

It is an arithmetic number, because the mean of its divisors is an integer number (3720833280).

Almost surely, 2^261376415850 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261376415850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (357199994880).

261376415850 is an abundant number, since it is smaller than the sum of its proper divisors (453023573910).

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

261376415850 is a wasteful number, since it uses less digits than its factorization.

261376415850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3565 (or 3560 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 48.

The spelling of 261376415850 in words is "two hundred sixty-one billion, three hundred seventy-six million, four hundred fifteen thousand, eight hundred fifty".