13005478634 has 4 divisors (see below), whose sum is σ = 19508217954. Its totient is φ = 6502739316.

The previous prime is 13005478631. The next prime is 13005478643. The reversal of 13005478634 is 43687450031.

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

It can be written as a sum of positive squares in only one way, i.e., 6741231025 + 6264247609 = 82105^2 + 79147^2 .

It is a junction number, because it is equal to n+sod(n) for n = 13005478591 and 13005478600.

It is not an unprimeable number, because it can be changed into a prime (13005478631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3251369657 + ... + 3251369660.

Almost surely, 2^13005478634 is an apocalyptic number.

13005478634 is a deficient number, since it is larger than the sum of its proper divisors (6502739320).

13005478634 is an equidigital number, since it uses as much as digits as its factorization.

13005478634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6502739319.

The product of its (nonzero) digits is 241920, while the sum is 41.

The spelling of 13005478634 in words is "thirteen billion, five million, four hundred seventy-eight thousand, six hundred thirty-four".