100188316561 has 4 divisors (see below), whose sum is σ = 100191552112. Its totient is φ = 100185081012.

The previous prime is 100188316537. The next prime is 100188316577. The reversal of 100188316561 is 165613881001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 165613881001 = 953 ⋅173781617.

It is a cyclic number.

It is not a de Polignac number, because 100188316561 - 2⁷ = 100188316433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100188316531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1570875 + ... + 1633408.

It is an arithmetic number, because the mean of its divisors is an integer number (25047888028).

Almost surely, 2^100188316561 is an apocalyptic number.

It is an amenable number.

100188316561 is a deficient number, since it is larger than the sum of its proper divisors (3235551).

100188316561 is an equidigital number, since it uses as much as digits as its factorization.

100188316561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3235550.

The product of its (nonzero) digits is 34560, while the sum is 40.

The spelling of 100188316561 in words is "one hundred billion, one hundred eighty-eight million, three hundred sixteen thousand, five hundred sixty-one".