15402547449 has 27 divisors (see below), whose sum is σ = 22826619309. Its totient is φ = 10007988480.

The previous prime is 15402547421. The next prime is 15402547469. The reversal of 15402547449 is 94474520451.

The square root of 15402547449 is 124107.

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

15402547449 is a `hidden beast` number, since 1 + 540 + 25 + 47 + 4 + 49 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 7345689849 + 8056857600 = 85707^2 + 89760^2 .

It is not a de Polignac number, because 15402547449 - 2²⁷ = 15268329721 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (15402547409) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 15264657 + ... + 15265665.

Almost surely, 2^15402547449 is an apocalyptic number.

15402547449 is the 124107-th square number.

15402547449 is the 62054-th centered octagonal number.

It is an amenable number.

15402547449 is a deficient number, since it is larger than the sum of its proper divisors (7424071860).

15402547449 is an frugal number, since it uses more digits than its factorization.

15402547449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2106 (or 1053 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 45.

The spelling of 15402547449 in words is "fifteen billion, four hundred two million, five hundred forty-seven thousand, four hundred forty-nine".