100721722323609 has 12 divisors (see below), whose sum is σ = 146548880657556. Its totient is φ = 66657684845952.

The previous prime is 100721722323493. The next prime is 100721722323689. The reversal of 100721722323609 is 906323227127001.

100721722323609 is a `hidden beast` number, since 1 + 0 + 0 + 7 + 2 + 1 + 7 + 2 + 2 + 32 + 3 + 609 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 64700659243584 + 36021063080025 = 8043672^2 + 6001755^2 .

It is not a de Polignac number, because 100721722323609 - 2²³ = 100721713935001 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (100721722323689) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40844168404 + ... + 40844170869.

It is an arithmetic number, because the mean of its divisors is an integer number (12212406721463).

Almost surely, 2^{100721722323609} is an apocalyptic number.

It is an amenable number.

100721722323609 is a deficient number, since it is larger than the sum of its proper divisors (45827158333947).

100721722323609 is a wasteful number, since it uses less digits than its factorization.

100721722323609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81688339416 (or 81688339413 counting only the distinct ones).

The product of its (nonzero) digits is 381024, while the sum is 45.

The spelling of 100721722323609 in words is "one hundred trillion, seven hundred twenty-one billion, seven hundred twenty-two million, three hundred twenty-three thousand, six hundred nine".