2157508811 has 8 divisors (see below), whose sum is σ = 2286512064. Its totient is φ = 2028737920.

The previous prime is 2157508799. The next prime is 2157508841. The reversal of 2157508811 is 1188057512.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2157508811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2157508841) 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, 38780 + ... + 76281.

It is an arithmetic number, because the mean of its divisors is an integer number (285814008).

Almost surely, 2^2157508811 is an apocalyptic number.

2157508811 is a deficient number, since it is larger than the sum of its proper divisors (129003253).

2157508811 is a wasteful number, since it uses less digits than its factorization.

2157508811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116181.

The product of its (nonzero) digits is 22400, while the sum is 38.

The square root of 2157508811 is about 46448.9914960487. The cubic root of 2157508811 is about 1292.1636687721.

The spelling of 2157508811 in words is "two billion, one hundred fifty-seven million, five hundred eight thousand, eight hundred eleven".