261373121607030 has 128 divisors (see below), whose sum is σ = 649909954391040. Its totient is φ = 67245229793280.

The previous prime is 261373121606999. The next prime is 261373121607041. The reversal of 261373121607030 is 30706121373162.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 11281237 + ... + 25495343.

It is an arithmetic number, because the mean of its divisors is an integer number (5077421518680).

Almost surely, 2^{261373121607030} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261373121607030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (324954977195520).

261373121607030 is an abundant number, since it is smaller than the sum of its proper divisors (388536832784010).

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

261373121607030 is a wasteful number, since it uses less digits than its factorization.

261373121607030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14214374.

The product of its (nonzero) digits is 190512, while the sum is 42.

The spelling of 261373121607030 in words is "two hundred sixty-one trillion, three hundred seventy-three billion, one hundred twenty-one million, six hundred seven thousand, thirty".