22161657 has 32 divisors (see below), whose sum is σ = 36121600. Its totient is φ = 11803968.

The previous prime is 22161647. The next prime is 22161661. The reversal of 22161657 is 75616122.

22161657 is nontrivially palindromic in base 5.

It is not a de Polignac number, because 22161657 - 2¹⁶ = 22096121 is a prime.

It is a super-2 number, since 2×22161657² = 982278081971298, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22161617) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26319 + ... + 27147.

It is an arithmetic number, because the mean of its divisors is an integer number (1128800).

Almost surely, 2^22161657 is an apocalyptic number.

It is an amenable number.

22161657 is a deficient number, since it is larger than the sum of its proper divisors (13959943).

22161657 is a wasteful number, since it uses less digits than its factorization.

22161657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 925.

The product of its digits is 5040, while the sum is 30.

The square root of 22161657 is about 4707.6169130463. The cubic root of 22161657 is about 280.8885759437. Note that the first 3 decimals are identical.

Adding to 22161657 its reverse (75616122), we get a palindrome (97777779).

The spelling of 22161657 in words is "twenty-two million, one hundred sixty-one thousand, six hundred fifty-seven".