5657942521449 has 9 divisors (see below), whose sum is σ = 8172593949559. Its totient is φ = 3771956923680.

The previous prime is 5657942521411. The next prime is 5657942521471. The reversal of 5657942521449 is 9441252497565.

It is a happy number.

The square root of 5657942521449 is 2378643.

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

5657942521449 is a `hidden beast` number, since 5 + 6 + 57 + 94 + 2 + 52 + 1 + 449 = 666.

It can be written as a sum of positive squares in only one way, i.e., 2135564281449 + 3522378240000 = 1461357^2 + 1876800^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 5657942521449 - 2¹⁷ = 5657942390377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5657942521499) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 6739489 + ... + 7532369.

Almost surely, 2^{5657942521449} is an apocalyptic number.

5657942521449 is the 2378643-rd square number.

5657942521449 is the 1189322-nd centered octagonal number.

It is an amenable number.

5657942521449 is a deficient number, since it is larger than the sum of its proper divisors (2514651428110).

5657942521449 is an frugal number, since it uses more digits than its factorization.

5657942521449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1585768 (or 792884 counting only the distinct ones).

The product of its digits is 108864000, while the sum is 63.

The spelling of 5657942521449 in words is "five trillion, six hundred fifty-seven billion, nine hundred forty-two million, five hundred twenty-one thousand, four hundred forty-nine".