261544501261030 has 128 divisors (see below), whose sum is σ = 543341951308800. Its totient is φ = 89844129068544.

The previous prime is 261544501260943. The next prime is 261544501261033. The reversal of 261544501261030 is 30162105445162.

It is a super-2 number, since 2×261544501261030² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261544501261033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 30417016 + ... + 38056324.

It is an arithmetic number, because the mean of its divisors is an integer number (4244858994600).

Almost surely, 2^{261544501261030} is an apocalyptic number.

261544501261030 is an abundant number, since it is smaller than the sum of its proper divisors (281797450047770).

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

261544501261030 is a wasteful number, since it uses less digits than its factorization.

261544501261030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7639598.

The product of its (nonzero) digits is 172800, while the sum is 40.

The spelling of 261544501261030 in words is "two hundred sixty-one trillion, five hundred forty-four billion, five hundred one million, two hundred sixty-one thousand, thirty".