7665919513 has 6 divisors (see below), whose sum is σ = 8917498266. Its totient is φ = 6570788112.

The previous prime is 7665919451. The next prime is 7665919559. The reversal of 7665919513 is 3159195667.

7665919513 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 5174212624 + 2491706889 = 71932^2 + 49917^2 .

It is not a de Polignac number, because 7665919513 - 2¹³ = 7665911321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7665919013) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 78223620 + ... + 78223717.

It is an arithmetic number, because the mean of its divisors is an integer number (1486249711).

Almost surely, 2^7665919513 is an apocalyptic number.

It is an amenable number.

7665919513 is a deficient number, since it is larger than the sum of its proper divisors (1251578753).

7665919513 is a wasteful number, since it uses less digits than its factorization.

7665919513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156447351 (or 156447344 counting only the distinct ones).

The product of its digits is 1530900, while the sum is 52.

The square root of 7665919513 is about 87555.2369250406. The cubic root of 7665919513 is about 1971.7631764593.

The spelling of 7665919513 in words is "seven billion, six hundred sixty-five million, nine hundred nineteen thousand, five hundred thirteen".