15780657449 has 8 divisors (see below), whose sum is σ = 15984616032. Its totient is φ = 15577028320.

The previous prime is 15780657437. The next prime is 15780657457. The reversal of 15780657449 is 94475608751.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 15780657449 - 2¹² = 15780653353 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 15780657394 and 15780657403.

It is not an unprimeable number, because it can be changed into a prime (15780657479) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14789 + ... + 178269.

It is an arithmetic number, because the mean of its divisors is an integer number (1998077004).

Almost surely, 2^15780657449 is an apocalyptic number.

It is an amenable number.

15780657449 is a deficient number, since it is larger than the sum of its proper divisors (203958583).

15780657449 is a wasteful number, since it uses less digits than its factorization.

15780657449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164727.

The product of its (nonzero) digits is 8467200, while the sum is 56.

The spelling of 15780657449 in words is "fifteen billion, seven hundred eighty million, six hundred fifty-seven thousand, four hundred forty-nine".