2156391626 has 8 divisors (see below), whose sum is σ = 3273558624. Its totient is φ = 1065205420.

The previous prime is 2156391613. The next prime is 2156391637. The reversal of 2156391626 is 6261936512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6494990 + ... + 6495321.

It is an arithmetic number, because the mean of its divisors is an integer number (409194828).

Almost surely, 2^2156391626 is an apocalyptic number.

2156391626 is a deficient number, since it is larger than the sum of its proper divisors (1117166998).

2156391626 is a wasteful number, since it uses less digits than its factorization.

2156391626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12990396.

The product of its digits is 116640, while the sum is 41.

The square root of 2156391626 is about 46436.9640049821. The cubic root of 2156391626 is about 1291.9405974376.

The spelling of 2156391626 in words is "two billion, one hundred fifty-six million, three hundred ninety-one thousand, six hundred twenty-six".