100661561095 has 4 divisors (see below), whose sum is σ = 120793873320. Its totient is φ = 80529248872.

The previous prime is 100661561069. The next prime is 100661561111. The reversal of 100661561095 is 590165166001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 590165166001 = 8467 ⋅69701803.

It is a cyclic number.

It is not a de Polignac number, because 100661561095 - 2¹³ = 100661552903 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10066156105 + ... + 10066156114.

It is an arithmetic number, because the mean of its divisors is an integer number (30198468330).

Almost surely, 2^100661561095 is an apocalyptic number.

100661561095 is a deficient number, since it is larger than the sum of its proper divisors (20132312225).

100661561095 is an equidigital number, since it uses as much as digits as its factorization.

100661561095 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20132312224.

The product of its (nonzero) digits is 48600, while the sum is 40.

The spelling of 100661561095 in words is "one hundred billion, six hundred sixty-one million, five hundred sixty-one thousand, ninety-five".