7765115665 has 16 divisors (see below), whose sum is σ = 9560463696. Its totient is φ = 6051020800.

The previous prime is 7765115641. The next prime is 7765115671. The reversal of 7765115665 is 5665115677.

It can be written as a sum of positive squares in 8 ways, for example, as 246144721 + 7518970944 = 15689^2 + 86712^2 .

It is not a de Polignac number, because 7765115665 - 2¹⁷ = 7764984593 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101859 + ... + 160951.

It is an arithmetic number, because the mean of its divisors is an integer number (597528981).

Almost surely, 2^7765115665 is an apocalyptic number.

It is an amenable number.

7765115665 is a deficient number, since it is larger than the sum of its proper divisors (1795348031).

7765115665 is a wasteful number, since it uses less digits than its factorization.

7765115665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59780.

The product of its digits is 1323000, while the sum is 49.

The square root of 7765115665 is about 88119.8936960321. The cubic root of 7765115665 is about 1980.2315534556.

The spelling of 7765115665 in words is "seven billion, seven hundred sixty-five million, one hundred fifteen thousand, six hundred sixty-five".