2157256689 has 8 divisors (see below), whose sum is σ = 3287248320. Its totient is φ = 1232718096.

The previous prime is 2157256681. The next prime is 2157256691. The reversal of 2157256689 is 9866527512.

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

It is not a de Polignac number, because 2157256689 - 2³ = 2157256681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2157256681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51363234 + ... + 51363275.

It is an arithmetic number, because the mean of its divisors is an integer number (410906040).

Almost surely, 2^2157256689 is an apocalyptic number.

It is an amenable number.

2157256689 is a deficient number, since it is larger than the sum of its proper divisors (1129991631).

2157256689 is a wasteful number, since it uses less digits than its factorization.

2157256689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102726519.

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

The square root of 2157256689 is about 46446.2774504050. The cubic root of 2157256689 is about 1292.1133336235.

The spelling of 2157256689 in words is "two billion, one hundred fifty-seven million, two hundred fifty-six thousand, six hundred eighty-nine".