261600415240 has 32 divisors (see below), whose sum is σ = 623224520280. Its totient is φ = 98484861952.

The previous prime is 261600415229. The next prime is 261600415243. The reversal of 261600415240 is 42514006162.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 239670951844 + 21929463396 = 489562^2 + 148086^2 .

It is not an unprimeable number, because it can be changed into a prime (261600415243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 192352567 + ... + 192353926.

Almost surely, 2^261600415240 is an apocalyptic number.

261600415240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261600415240 is an abundant number, since it is smaller than the sum of its proper divisors (361624105040).

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

261600415240 is a wasteful number, since it uses less digits than its factorization.

261600415240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384706521 (or 384706517 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The spelling of 261600415240 in words is "two hundred sixty-one billion, six hundred million, four hundred fifteen thousand, two hundred forty".