102818665 has 4 divisors (see below), whose sum is σ = 123382404. Its totient is φ = 82254928.

The previous prime is 102818647. The next prime is 102818689. The reversal of 102818665 is 566818201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 566818201 = 149 ⋅3804149.

It can be written as a sum of positive squares in 2 ways, for example, as 22250089 + 80568576 = 4717^2 + 8976^2 .

It is a cyclic number.

It is not a de Polignac number, because 102818665 - 2¹⁵ = 102785897 is a prime.

It is a Duffinian 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, 10281862 + ... + 10281871.

It is an arithmetic number, because the mean of its divisors is an integer number (30845601).

Almost surely, 2^102818665 is an apocalyptic number.

It is an amenable number.

102818665 is a deficient number, since it is larger than the sum of its proper divisors (20563739).

102818665 is an equidigital number, since it uses as much as digits as its factorization.

102818665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20563738.

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 102818665 is about 10139.9538953587. The cubic root of 102818665 is about 468.4795669144.

The spelling of 102818665 in words is "one hundred two million, eight hundred eighteen thousand, six hundred sixty-five".