15781782824057 has 16 divisors (see below), whose sum is σ = 16964733804480. Its totient is φ = 14627739474432.

The previous prime is 15781782824021. The next prime is 15781782824107. The reversal of 15781782824057 is 75042828718751.

It is a cyclic number.

It is not a de Polignac number, because 15781782824057 - 2²⁰ = 15781781775481 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 15781782823984 and 15781782824002.

It is not an unprimeable number, because it can be changed into a prime (15781722824057) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8830883 + ... + 10466520.

It is an arithmetic number, because the mean of its divisors is an integer number (1060295862780).

Almost surely, 2^{15781782824057} is an apocalyptic number.

15781782824057 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

15781782824057 is a deficient number, since it is larger than the sum of its proper divisors (1182950980423).

15781782824057 is a wasteful number, since it uses less digits than its factorization.

15781782824057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19298152.

The product of its (nonzero) digits is 70246400, while the sum is 65.

The spelling of 15781782824057 in words is "fifteen trillion, seven hundred eighty-one billion, seven hundred eighty-two million, eight hundred twenty-four thousand, fifty-seven".