2157826465 has 8 divisors (see below), whose sum is σ = 2590072128. Its totient is φ = 1725807600.

The previous prime is 2157826441. The next prime is 2157826477. The reversal of 2157826465 is 5646287512.

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

It is not a de Polignac number, because 2157826465 - 2¹⁹ = 2157302177 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35011 + ... + 74440.

It is an arithmetic number, because the mean of its divisors is an integer number (323759016).

Almost surely, 2^2157826465 is an apocalyptic number.

It is an amenable number.

2157826465 is a deficient number, since it is larger than the sum of its proper divisors (432245663).

2157826465 is a wasteful number, since it uses less digits than its factorization.

2157826465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113399.

The product of its digits is 806400, while the sum is 46.

The square root of 2157826465 is about 46452.4107555248. The cubic root of 2157826465 is about 1292.2270815398.

The spelling of 2157826465 in words is "two billion, one hundred fifty-seven million, eight hundred twenty-six thousand, four hundred sixty-five".