13071905906 has 4 divisors (see below), whose sum is σ = 19607858862. Its totient is φ = 6535952952.

The previous prime is 13071905881. The next prime is 13071905909. The reversal of 13071905906 is 60950917031.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60950917031 = 367 ⋅166078793.

It can be written as a sum of positive squares in only one way, i.e., 10243261681 + 2828644225 = 101209^2 + 53185^2 .

It is not an unprimeable number, because it can be changed into a prime (13071905909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3267976475 + ... + 3267976478.

Almost surely, 2^13071905906 is an apocalyptic number.

13071905906 is a deficient number, since it is larger than the sum of its proper divisors (6535952956).

13071905906 is an equidigital number, since it uses as much as digits as its factorization.

13071905906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6535952955.

The product of its (nonzero) digits is 51030, while the sum is 41.

The spelling of 13071905906 in words is "thirteen billion, seventy-one million, nine hundred five thousand, nine hundred six".