100722389138 has 18 divisors (see below), whose sum is σ = 175755773511. Its totient is φ = 43165391724.

The previous prime is 100722389059. The next prime is 100722389167. The reversal of 100722389138 is 831983227001.

It can be written as a sum of positive squares in only one way, i.e., 50361194569 + 50361194569 = 224413^2 + 224413^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=224413.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3125753 + ... + 3157811.

Almost surely, 2^100722389138 is an apocalyptic number.

100722389138 is a deficient number, since it is larger than the sum of its proper divisors (75033384373).

100722389138 is an frugal number, since it uses more digits than its factorization.

100722389138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64134 (or 32068 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 44.

The spelling of 100722389138 in words is "one hundred billion, seven hundred twenty-two million, three hundred eighty-nine thousand, one hundred thirty-eight".