2157516806 has 8 divisors (see below), whose sum is σ = 3236474064. Its totient is φ = 1078692120.

The previous prime is 2157516793. The next prime is 2157516833. The reversal of 2157516806 is 6086157512.

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

It is a congruent 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, 38636 + ... + 76208.

It is an arithmetic number, because the mean of its divisors is an integer number (404559258).

Almost surely, 2^2157516806 is an apocalyptic number.

2157516806 is a deficient number, since it is larger than the sum of its proper divisors (1078957258).

2157516806 is a wasteful number, since it uses less digits than its factorization.

2157516806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66286.

The product of its (nonzero) digits is 100800, while the sum is 41.

The square root of 2157516806 is about 46449.0775581173. The cubic root of 2157516806 is about 1292.1652648777.

The spelling of 2157516806 in words is "two billion, one hundred fifty-seven million, five hundred sixteen thousand, eight hundred six".