15557434287857 has 16 divisors (see below), whose sum is σ = 19869361755264. Its totient is φ = 11827001040000.

The previous prime is 15557434287847. The next prime is 15557434287869. The reversal of 15557434287857 is 75878243475551.

It is not a de Polignac number, because 15557434287857 - 2¹⁰ = 15557434286833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15557434287847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2463955394 + ... + 2463961707.

It is an arithmetic number, because the mean of its divisors is an integer number (1241835109704).

Almost surely, 2^{15557434287857} is an apocalyptic number.

It is an amenable number.

15557434287857 is a deficient number, since it is larger than the sum of its proper divisors (4311927467407).

15557434287857 is a wasteful number, since it uses less digits than its factorization.

15557434287857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4927917160.

The product of its digits is 1317120000, while the sum is 71.

The spelling of 15557434287857 in words is "fifteen trillion, five hundred fifty-seven billion, four hundred thirty-four million, two hundred eighty-seven thousand, eight hundred fifty-seven".