100665161 has 4 divisors (see below), whose sum is σ = 100814532. Its totient is φ = 100515792.

The previous prime is 100665137. The next prime is 100665163. The reversal of 100665161 is 161566001.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 49970761 + 50694400 = 7069^2 + 7120^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100665161 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 100665161.

It is not an unprimeable number, because it can be changed into a prime (100665163) 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, 73670 + ... + 75023.

It is an arithmetic number, because the mean of its divisors is an integer number (25203633).

Almost surely, 2^100665161 is an apocalyptic number.

It is an amenable number.

100665161 is a deficient number, since it is larger than the sum of its proper divisors (149371).

100665161 is an equidigital number, since it uses as much as digits as its factorization.

100665161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149370.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 100665161 is about 10033.2029282777. The cubic root of 100665161 is about 465.1857445788.

The spelling of 100665161 in words is "one hundred million, six hundred sixty-five thousand, one hundred sixty-one".