7949338681 has 4 divisors (see below), whose sum is σ = 7989690852. Its totient is φ = 7908986512.

The previous prime is 7949338673. The next prime is 7949338697. The reversal of 7949338681 is 1868339497.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4828999081 + 3120339600 = 69491^2 + 55860^2 .

It is a cyclic number.

It is not a de Polignac number, because 7949338681 - 2³ = 7949338673 is a prime.

It is a super-2 number, since 2×7949338681² (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 (7949338081) 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, 20175790 + ... + 20176183.

It is an arithmetic number, because the mean of its divisors is an integer number (1997422713).

Almost surely, 2^7949338681 is an apocalyptic number.

It is an amenable number.

7949338681 is a deficient number, since it is larger than the sum of its proper divisors (40352171).

7949338681 is a wasteful number, since it uses less digits than its factorization.

7949338681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40352170.

The product of its digits is 7838208, while the sum is 58.

The square root of 7949338681 is about 89159.0639307076. The cubic root of 7949338681 is about 1995.7692802323.

The spelling of 7949338681 in words is "seven billion, nine hundred forty-nine million, three hundred thirty-eight thousand, six hundred eighty-one".