7156885681 has 8 divisors (see below), whose sum is σ = 7883313984. Its totient is φ = 6443091120.

The previous prime is 7156885651. The next prime is 7156885699. The reversal of 7156885681 is 1865886517.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7156885681 - 2¹¹ = 7156883633 is a prime.

It is a super-2 number, since 2×7156885681² (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 (7156885601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3157246 + ... + 3159511.

It is an arithmetic number, because the mean of its divisors is an integer number (985414248).

Almost surely, 2^7156885681 is an apocalyptic number.

It is an amenable number.

7156885681 is a deficient number, since it is larger than the sum of its proper divisors (726428303).

7156885681 is a wasteful number, since it uses less digits than its factorization.

7156885681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6316871.

The product of its digits is 3225600, while the sum is 55.

The square root of 7156885681 is about 84598.3787137791. The cubic root of 7156885681 is about 1927.1167523083.

The spelling of 7156885681 in words is "seven billion, one hundred fifty-six million, eight hundred eighty-five thousand, six hundred eighty-one".