7156788381 has 54 divisors (see below), whose sum is σ = 10870890030. Its totient is φ = 4536642816.

The previous prime is 7156788341. The next prime is 7156788389. The reversal of 7156788381 is 1838876517.

It is a happy number.

7156788381 is a `hidden beast` number, since 71 + 567 + 8 + 8 + 3 + 8 + 1 = 666.

It can be written as a sum of positive squares in 9 ways, for example, as 376748100 + 6780040281 = 19410^2 + 82341^2 .

It is not a de Polignac number, because 7156788381 - 2⁷ = 7156788253 is a prime.

It is a super-2 number, since 2×7156788381² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7156788389) 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 53 ways as a sum of consecutive naturals, for example, 65658555 + ... + 65658663.

Almost surely, 2^7156788381 is an apocalyptic number.

It is an amenable number.

7156788381 is a deficient number, since it is larger than the sum of its proper divisors (3714101649).

7156788381 is a wasteful number, since it uses less digits than its factorization.

7156788381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335 (or 222 counting only the distinct ones).

The product of its digits is 2257920, while the sum is 54.

The square root of 7156788381 is about 84597.8036417022. The cubic root of 7156788381 is about 1927.1080190260.

The spelling of 7156788381 in words is "seven billion, one hundred fifty-six million, seven hundred eighty-eight thousand, three hundred eighty-one".