3158866638 has 48 divisors (see below), whose sum is σ = 7036725696. Its totient is φ = 1023399360.

The previous prime is 3158866637. The next prime is 3158866649. The reversal of 3158866638 is 8366688513.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3158866637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 817920 + ... + 821772.

It is an arithmetic number, because the mean of its divisors is an integer number (146598452).

Almost surely, 2^3158866638 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3158866638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3518362848).

3158866638 is an abundant number, since it is smaller than the sum of its proper divisors (3877859058).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3158866638 is a wasteful number, since it uses less digits than its factorization.

3158866638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5129 (or 5126 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 54.

The square root of 3158866638 is about 56203.7955835725. The cubic root of 3158866638 is about 1467.2713256730.

The spelling of 3158866638 in words is "three billion, one hundred fifty-eight million, eight hundred sixty-six thousand, six hundred thirty-eight".