2158725966 has 16 divisors (see below), whose sum is σ = 4318012800. Its totient is φ = 719481848.

The previous prime is 2158725953. The next prime is 2158725991. The reversal of 2158725966 is 6695278512.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39805 + ... + 76823.

It is an arithmetic number, because the mean of its divisors is an integer number (269875800).

Almost surely, 2^2158725966 is an apocalyptic number.

2158725966 is an abundant number, since it is smaller than the sum of its proper divisors (2159286834).

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

2158725966 is a wasteful number, since it uses less digits than its factorization.

2158725966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46743.

The product of its digits is 1814400, while the sum is 51.

The square root of 2158725966 is about 46462.0917092634. The cubic root of 2158725966 is about 1292.4066137522.

The spelling of 2158725966 in words is "two billion, one hundred fifty-eight million, seven hundred twenty-five thousand, nine hundred sixty-six".