8257966138 has 48 divisors (see below), whose sum is σ = 14082321960. Its totient is φ = 3616386048.

The previous prime is 8257966117. The next prime is 8257966151. The reversal of 8257966138 is 8316697528.

It can be written as a sum of positive squares in 4 ways, for example, as 7403397849 + 854568289 = 86043^2 + 29233^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 659278 + ... + 671686.

Almost surely, 2^8257966138 is an apocalyptic number.

8257966138 is a deficient number, since it is larger than the sum of its proper divisors (5824355822).

8257966138 is a wasteful number, since it uses less digits than its factorization.

8257966138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12511 (or 12488 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 55.

The square root of 8257966138 is about 90873.3521886367. The cubic root of 8257966138 is about 2021.2701662596.

The spelling of 8257966138 in words is "eight billion, two hundred fifty-seven million, nine hundred sixty-six thousand, one hundred thirty-eight".