7745311665 has 96 divisors (see below), whose sum is σ = 17249823360. Its totient is φ = 3268315008.

The previous prime is 7745311657. The next prime is 7745311669. The reversal of 7745311665 is 5661135477.

7745311665 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 7745311665 - 2³ = 7745311657 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 7745311665.

It is not an unprimeable number, because it can be changed into a prime (7745311669) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 40962 + ... + 131028.

It is an arithmetic number, because the mean of its divisors is an integer number (179685660).

Almost surely, 2^7745311665 is an apocalyptic number.

It is an amenable number.

7745311665 is an abundant number, since it is smaller than the sum of its proper divisors (9504511695).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7745311665 is a wasteful number, since it uses less digits than its factorization.

7745311665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90108 (or 90095 counting only the distinct ones).

The product of its digits is 529200, while the sum is 45.

The square root of 7745311665 is about 88007.4523264934. The cubic root of 7745311665 is about 1978.5466722639.

The spelling of 7745311665 in words is "seven billion, seven hundred forty-five million, three hundred eleven thousand, six hundred sixty-five".