100561540025 has 6 divisors (see below), whose sum is σ = 124696309662. Its totient is φ = 80449232000.

The previous prime is 100561540021. The next prime is 100561540043. The reversal of 100561540025 is 520045165001.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 543682489 + 100017857536 = 23317^2 + 316256^2 .

It is not a de Polignac number, because 100561540025 - 2² = 100561540021 is a prime.

It is a super-2 number, since 2×100561540025² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 100561540025.

It is not an unprimeable number, because it can be changed into a prime (100561540021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2011230776 + ... + 2011230825.

It is an arithmetic number, because the mean of its divisors is an integer number (20782718277).

Almost surely, 2^100561540025 is an apocalyptic number.

It is an amenable number.

100561540025 is a deficient number, since it is larger than the sum of its proper divisors (24134769637).

100561540025 is an equidigital number, since it uses as much as digits as its factorization.

100561540025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4022461611 (or 4022461606 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 29.

The spelling of 100561540025 in words is "one hundred billion, five hundred sixty-one million, five hundred forty thousand, twenty-five".