100944202581 has 12 divisors (see below), whose sum is σ = 145817067552. Its totient is φ = 67292085096.

The previous prime is 100944202571. The next prime is 100944202609. The reversal of 100944202581 is 185202449001.

100944202581 is a `hidden beast` number, since 10 + 0 + 9 + 44 + 20 + 2 + 581 = 666.

It is not a de Polignac number, because 100944202581 - 2¹⁰ = 100944201557 is a prime.

It is a super-2 number, since 2×100944202581² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100944202571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 175551 + ... + 482396.

It is an arithmetic number, because the mean of its divisors is an integer number (12151422296).

Almost surely, 2^100944202581 is an apocalyptic number.

It is an amenable number.

100944202581 is a deficient number, since it is larger than the sum of its proper divisors (44872864971).

100944202581 is a wasteful number, since it uses less digits than its factorization.

100944202581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 675000 (or 674997 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The spelling of 100944202581 in words is "one hundred billion, nine hundred forty-four million, two hundred two thousand, five hundred eighty-one".