7691994557 has 4 divisors (see below), whose sum is σ = 8283686460. Its totient is φ = 7100302656.

The previous prime is 7691994553. The next prime is 7691994587. The reversal of 7691994557 is 7554991967.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7554991967 = 409 ⋅18471863.

It can be written as a sum of positive squares in 2 ways, for example, as 2653692196 + 5038302361 = 51514^2 + 70981^2 .

It is a cyclic number.

It is not a de Polignac number, because 7691994557 - 2² = 7691994553 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7691994557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7691994553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 295845932 + ... + 295845957.

It is an arithmetic number, because the mean of its divisors is an integer number (2070921615).

Almost surely, 2^7691994557 is an apocalyptic number.

It is an amenable number.

7691994557 is a deficient number, since it is larger than the sum of its proper divisors (591691903).

7691994557 is a wasteful number, since it uses less digits than its factorization.

7691994557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 591691902.

The product of its digits is 21432600, while the sum is 62.

The square root of 7691994557 is about 87704.0167666225. The cubic root of 7691994557 is about 1973.9962474783.

The spelling of 7691994557 in words is "seven billion, six hundred ninety-one million, nine hundred ninety-four thousand, five hundred fifty-seven".