7665998331 has 4 divisors (see below), whose sum is σ = 10221331112. Its totient is φ = 5110665552.

The previous prime is 7665998311. The next prime is 7665998383. The reversal of 7665998331 is 1338995667.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 7665998331 - 2⁵ = 7665998299 is a prime.

It is a super-2 number, since 2×7665998331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7665998311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1277666386 + ... + 1277666391.

It is an arithmetic number, because the mean of its divisors is an integer number (2555332778).

Almost surely, 2^7665998331 is an apocalyptic number.

7665998331 is a deficient number, since it is larger than the sum of its proper divisors (2555332781).

7665998331 is a wasteful number, since it uses less digits than its factorization.

7665998331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2555332780.

The product of its digits is 7348320, while the sum is 57.

The square root of 7665998331 is about 87555.6870283136. The cubic root of 7665998331 is about 1971.7699340699.

The spelling of 7665998331 in words is "seven billion, six hundred sixty-five million, nine hundred ninety-eight thousand, three hundred thirty-one".