7158638681 has 16 divisors (see below), whose sum is σ = 7714025280. Its totient is φ = 6618347520.

The previous prime is 7158638621. The next prime is 7158638689. The reversal of 7158638681 is 1868368517.

It is not a de Polignac number, because 7158638681 - 2²⁶ = 7091529817 is a prime.

It is a super-2 number, since 2×7158638681² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7158638689) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2352521 + ... + 2355561.

It is an arithmetic number, because the mean of its divisors is an integer number (482126580).

Almost surely, 2^7158638681 is an apocalyptic number.

It is an amenable number.

7158638681 is a deficient number, since it is larger than the sum of its proper divisors (555386599).

7158638681 is a wasteful number, since it uses less digits than its factorization.

7158638681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5464.

The product of its digits is 1935360, while the sum is 53.

The square root of 7158638681 is about 84608.7387980698. The cubic root of 7158638681 is about 1927.2740814426.

The spelling of 7158638681 in words is "seven billion, one hundred fifty-eight million, six hundred thirty-eight thousand, six hundred eighty-one".