12571815901 has 4 divisors (see below), whose sum is σ = 12572065404. Its totient is φ = 12571566400.

The previous prime is 12571815889. The next prime is 12571815929. The reversal of 12571815901 is 10951817521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 978125625 + 11593690276 = 31275^2 + 107674^2 .

It is a cyclic number.

It is not a de Polignac number, because 12571815901 - 2¹¹ = 12571813853 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12571815601) 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 3 ways as a sum of consecutive naturals, for example, 19660 + ... + 159781.

It is an arithmetic number, because the mean of its divisors is an integer number (3143016351).

Almost surely, 2^12571815901 is an apocalyptic number.

It is an amenable number.

12571815901 is a deficient number, since it is larger than the sum of its proper divisors (249503).

12571815901 is an equidigital number, since it uses as much as digits as its factorization.

12571815901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249502.

The product of its (nonzero) digits is 25200, while the sum is 40.

The spelling of 12571815901 in words is "twelve billion, five hundred seventy-one million, eight hundred fifteen thousand, nine hundred one".