7661333691 has 54 divisors (see below), whose sum is σ = 12768814188. Its totient is φ = 4389351120.

The previous prime is 7661333683. The next prime is 7661333711. The reversal of 7661333691 is 1963331667.

It is not a de Polignac number, because 7661333691 - 2³ = 7661333683 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7661333671) by changing a digit.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 16546926 + ... + 16547388.

It is an arithmetic number, because the mean of its divisors is an integer number (236459522).

Almost surely, 2^7661333691 is an apocalyptic number.

7661333691 is a deficient number, since it is larger than the sum of its proper divisors (5107480497).

7661333691 is a wasteful number, since it uses less digits than its factorization.

7661333691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 981 (or 496 counting only the distinct ones).

The product of its digits is 367416, while the sum is 45.

The square root of 7661333691 is about 87529.0448422694. The cubic root of 7661333691 is about 1971.3699225441.

The spelling of 7661333691 in words is "seven billion, six hundred sixty-one million, three hundred thirty-three thousand, six hundred ninety-one".