261488781413040 has 160 divisors (see below), whose sum is σ = 824832903315456. Its totient is φ = 68509893012480.

The previous prime is 261488781413039. The next prime is 261488781413053. The reversal of 261488781413040 is 40314187884162.

It is a super-2 number, since 2×261488781413040² (a number of 30 digits) contains 22 as substring.

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, 2917329 + ... + 23054031.

Almost surely, 2^{261488781413040} is an apocalyptic number.

261488781413040 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 261488781413040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (412416451657728).

261488781413040 is an abundant number, since it is smaller than the sum of its proper divisors (563344121902416).

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

261488781413040 is a wasteful number, since it uses less digits than its factorization.

261488781413040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20137667 (or 20137661 counting only the distinct ones).

The product of its (nonzero) digits is 8257536, while the sum is 57.

The spelling of 261488781413040 in words is "two hundred sixty-one trillion, four hundred eighty-eight billion, seven hundred eighty-one million, four hundred thirteen thousand, forty".