13505533994 has 4 divisors (see below), whose sum is σ = 20258300994. Its totient is φ = 6752766996.

The previous prime is 13505533931. The next prime is 13505534027. The reversal of 13505533994 is 49933550531.

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., 13501278025 + 4255969 = 116195^2 + 2063^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3376383497 + ... + 3376383500.

Almost surely, 2^13505533994 is an apocalyptic number.

13505533994 is a deficient number, since it is larger than the sum of its proper divisors (6752767000).

13505533994 is an equidigital number, since it uses as much as digits as its factorization.

13505533994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6752766999.

The product of its (nonzero) digits is 1093500, while the sum is 47.

The spelling of 13505533994 in words is "thirteen billion, five hundred five million, five hundred thirty-three thousand, nine hundred ninety-four".