7665537816 has 32 divisors (see below), whose sum is σ = 21293161200. Its totient is φ = 2555179200.

The previous prime is 7665537809. The next prime is 7665537823. The reversal of 7665537816 is 6187355667.

7665537816 is a `hidden beast` number, since 7 + 6 + 6 + 553 + 7 + 81 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (7665537809) and next prime (7665537823).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17744085 + ... + 17744516.

Almost surely, 2^7665537816 is an apocalyptic number.

It is an amenable number.

7665537816 is an abundant number, since it is smaller than the sum of its proper divisors (13627623384).

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

7665537816 is a wasteful number, since it uses less digits than its factorization.

7665537816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35488616 (or 35488606 counting only the distinct ones).

The product of its digits is 6350400, while the sum is 54.

The square root of 7665537816 is about 87553.0571482230. The cubic root of 7665537816 is about 1971.7304502882.

The spelling of 7665537816 in words is "seven billion, six hundred sixty-five million, five hundred thirty-seven thousand, eight hundred sixteen".