13187887478 has 4 divisors (see below), whose sum is σ = 19781831220. Its totient is φ = 6593943738.

The previous prime is 13187887469. The next prime is 13187887481. The reversal of 13187887478 is 87478878131.

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

It is a super-2 number, since 2×13187887478² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 13187887478.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3296971868 + ... + 3296971871.

It is an arithmetic number, because the mean of its divisors is an integer number (4945457805).

Almost surely, 2^13187887478 is an apocalyptic number.

13187887478 is a deficient number, since it is larger than the sum of its proper divisors (6593943742).

13187887478 is an equidigital number, since it uses as much as digits as its factorization.

13187887478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6593943741.

The product of its digits is 16859136, while the sum is 62.

The spelling of 13187887478 in words is "thirteen billion, one hundred eighty-seven million, eight hundred eighty-seven thousand, four hundred seventy-eight".