100561060555581 has 16 divisors (see below), whose sum is σ = 136279838131328. Its totient is φ = 65941500945600.

The previous prime is 100561060555567. The next prime is 100561060555583. The reversal of 100561060555581 is 185555060165001.

It is not a de Polignac number, because 100561060555581 - 2⁷ = 100561060555453 is a prime.

It is a super-2 number, since 2×100561060555581² (a number of 29 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 100561060555581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100561060555583) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 129028536 + ... + 129805566.

It is an arithmetic number, because the mean of its divisors is an integer number (8517489883208).

Almost surely, 2^{100561060555581} is an apocalyptic number.

It is an amenable number.

100561060555581 is a deficient number, since it is larger than the sum of its proper divisors (35718777575747).

100561060555581 is an equidigital number, since it uses as much as digits as its factorization.

100561060555581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1484292.

The product of its (nonzero) digits is 900000, while the sum is 48.

The spelling of 100561060555581 in words is "one hundred trillion, five hundred sixty-one billion, sixty million, five hundred fifty-five thousand, five hundred eighty-one".