858138630172 has 12 divisors (see below), whose sum is σ = 1538370471456. Its totient is φ = 418604209760.

The previous prime is 858138630161. The next prime is 858138630179. The reversal of 858138630172 is 271036831858.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (858138630179) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2616276148 + ... + 2616276475.

It is an arithmetic number, because the mean of its divisors is an integer number (128197539288).

Almost surely, 2^858138630172 is an apocalyptic number.

858138630172 is a gapful number since it is divisible by the number (82) formed by its first and last digit.

It is an amenable number.

858138630172 is a deficient number, since it is larger than the sum of its proper divisors (680231841284).

858138630172 is a wasteful number, since it uses less digits than its factorization.

858138630172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5232552668 (or 5232552666 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 52.

The spelling of 858138630172 in words is "eight hundred fifty-eight billion, one hundred thirty-eight million, six hundred thirty thousand, one hundred seventy-two".