261179320240 has 40 divisors (see below), whose sum is σ = 621363832848. Its totient is φ = 102042151680.

The previous prime is 261179320223. The next prime is 261179320291. The reversal of 261179320240 is 42023971162.

261179320240 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 261179320240.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37958671 + ... + 37965550.

Almost surely, 2^261179320240 is an apocalyptic number.

261179320240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261179320240 is an abundant number, since it is smaller than the sum of its proper divisors (360184512608).

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

261179320240 is a wasteful number, since it uses less digits than its factorization.

261179320240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75924277 (or 75924271 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 37.

The spelling of 261179320240 in words is "two hundred sixty-one billion, one hundred seventy-nine million, three hundred twenty thousand, two hundred forty".