100542665 has 4 divisors (see below), whose sum is σ = 120651204. Its totient is φ = 80434128.

The previous prime is 100542649. The next prime is 100542671. The reversal of 100542665 is 566245001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 566245001 = 7 ⋅80892143.

It can be written as a sum of positive squares in 2 ways, for example, as 35772361 + 64770304 = 5981^2 + 8048^2 .

It is a cyclic number.

It is not a de Polignac number, because 100542665 - 2⁴ = 100542649 is a prime.

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 3 ways as a sum of consecutive naturals, for example, 10054262 + ... + 10054271.

It is an arithmetic number, because the mean of its divisors is an integer number (30162801).

Almost surely, 2^100542665 is an apocalyptic number.

It is an amenable number.

100542665 is a deficient number, since it is larger than the sum of its proper divisors (20108539).

100542665 is an equidigital number, since it uses as much as digits as its factorization.

100542665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20108538.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 100542665 is about 10027.0965388790. The cubic root of 100542665 is about 464.9969784364.

Adding to 100542665 its reverse (566245001), we get a palindrome (666787666).

The spelling of 100542665 in words is "one hundred million, five hundred forty-two thousand, six hundred sixty-five".