261197641111440 has 160 divisors (see below), whose sum is σ = 883580265922176. Its totient is φ = 63302193377280.

The previous prime is 261197641111439. The next prime is 261197641111453. The reversal of 261197641111440 is 44111146791162.

It is a super-2 number, since 2×261197641111440² (a number of 30 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 261197641111440.

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, 5346799 + ... + 23473038.

Almost surely, 2^{261197641111440} is an apocalyptic number.

261197641111440 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 261197641111440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (441790132961088).

261197641111440 is an abundant number, since it is smaller than the sum of its proper divisors (622382624810736).

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

261197641111440 is a wasteful number, since it uses less digits than its factorization.

261197641111440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28823297 (or 28823291 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 48.

The spelling of 261197641111440 in words is "two hundred sixty-one trillion, one hundred ninety-seven billion, six hundred forty-one million, one hundred eleven thousand, four hundred forty".