8181957357 has 12 divisors (see below), whose sum is σ = 13506723360. Its totient is φ = 4675404168.

The previous prime is 8181957299. The next prime is 8181957359. The reversal of 8181957357 is 7537591818.

It is a happy number.

8181957357 is a `hidden beast` number, since 8 + 1 + 8 + 19 + 573 + 57 = 666.

It is not a de Polignac number, because 8181957357 - 2¹⁹ = 8181433069 is a prime.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8181957359) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64936107 + ... + 64936232.

It is an arithmetic number, because the mean of its divisors is an integer number (1125560280).

Almost surely, 2^8181957357 is an apocalyptic number.

It is an amenable number.

8181957357 is a deficient number, since it is larger than the sum of its proper divisors (5324766003).

8181957357 is a wasteful number, since it uses less digits than its factorization.

8181957357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129872352 (or 129872349 counting only the distinct ones).

The product of its digits is 2116800, while the sum is 54.

The square root of 8181957357 is about 90454.1726898212. The cubic root of 8181957357 is about 2015.0495840450.

The spelling of 8181957357 in words is "eight billion, one hundred eighty-one million, nine hundred fifty-seven thousand, three hundred fifty-seven".