261162503140 has 96 divisors (see below), whose sum is σ = 684319104000. Its totient is φ = 81336040320.

The previous prime is 261162503137. The next prime is 261162503177. The reversal of 261162503140 is 41305261162.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1871511 + ... + 2006209.

It is an arithmetic number, because the mean of its divisors is an integer number (7128324000).

Almost surely, 2^261162503140 is an apocalyptic number.

261162503140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261162503140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (342159552000).

261162503140 is an abundant number, since it is smaller than the sum of its proper divisors (423156600860).

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

261162503140 is a wasteful number, since it uses less digits than its factorization.

261162503140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135985 (or 135983 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The spelling of 261162503140 in words is "two hundred sixty-one billion, one hundred sixty-two million, five hundred three thousand, one hundred forty".