13256894987 has 8 divisors (see below), whose sum is σ = 15154351872. Its totient is φ = 11360341800.

The previous prime is 13256894977. The next prime is 13256894999. The reversal of 13256894987 is 78949865231.

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

It is a cyclic number.

It is not a de Polignac number, because 13256894987 - 2⁶ = 13256894923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13256894927) 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, 194189 + ... + 253422.

It is an arithmetic number, because the mean of its divisors is an integer number (1894293984).

Almost surely, 2^13256894987 is an apocalyptic number.

13256894987 is a deficient number, since it is larger than the sum of its proper divisors (1897456885).

13256894987 is an equidigital number, since it uses as much as digits as its factorization.

13256894987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451849.

The product of its digits is 26127360, while the sum is 62.

The spelling of 13256894987 in words is "thirteen billion, two hundred fifty-six million, eight hundred ninety-four thousand, nine hundred eighty-seven".