1615996449 has 6 divisors (see below), whose sum is σ = 2334217106. Its totient is φ = 1077330960.

The previous prime is 1615996409. The next prime is 1615996457. The reversal of 1615996449 is 9446995161.

1615996449 is a `hidden beast` number, since 1 + 6 + 1 + 599 + 6 + 4 + 49 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1080305424 + 535691025 = 32868^2 + 23145^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1615996449 is a prime.

It is a super-2 number, since 2×1615996449² = 5222889046361219202, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1615996395 and 1615996404.

It is not an unprimeable number, because it can be changed into a prime (1615996409) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 89777572 + ... + 89777589.

Almost surely, 2^1615996449 is an apocalyptic number.

It is an amenable number.

1615996449 is a deficient number, since it is larger than the sum of its proper divisors (718220657).

1615996449 is a wasteful number, since it uses less digits than its factorization.

1615996449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179555167 (or 179555164 counting only the distinct ones).

The product of its digits is 2099520, while the sum is 54.

The square root of 1615996449 is about 40199.4583172460. The cubic root of 1615996449 is about 1173.4920021431.

The spelling of 1615996449 in words is "one billion, six hundred fifteen million, nine hundred ninety-six thousand, four hundred forty-nine".