22158406449 has 45 divisors (see below), whose sum is σ = 33721059853. Its totient is φ = 14021138544.

The previous prime is 22158406447. The next prime is 22158406453. The reversal of 22158406449 is 94460485122.

It is a happy number.

The square root of 22158406449 is 148857.

It is a perfect power (a square), and thus also a powerful number.

22158406449 is a `hidden beast` number, since 2 + 2 + 1 + 584 + 0 + 64 + 4 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 52664049 + 22105742400 = 7257^2 + 148680^2 .

It is not a de Polignac number, because 22158406449 - 2¹ = 22158406447 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22158406447) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 375566182 + ... + 375566240.

Almost surely, 2^22158406449 is an apocalyptic number.

22158406449 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

22158406449 is the 148857-th square number.

22158406449 is the 74429-th centered octagonal number.

It is an amenable number.

22158406449 is a deficient number, since it is larger than the sum of its proper divisors (11562653404).

22158406449 is an frugal number, since it uses more digits than its factorization.

22158406449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240 (or 91 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 45.

The spelling of 22158406449 in words is "twenty-two billion, one hundred fifty-eight million, four hundred six thousand, four hundred forty-nine".