15478664473 has 4 divisors (see below), whose sum is σ = 15478913380. Its totient is φ = 15478415568.

The previous prime is 15478664459. The next prime is 15478664483. The reversal of 15478664473 is 37446687451.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 6805095049 + 8673569424 = 82493^2 + 93132^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15478664473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15478664483) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57511 + ... + 185107.

It is an arithmetic number, because the mean of its divisors is an integer number (3869728345).

Almost surely, 2^15478664473 is an apocalyptic number.

It is an amenable number.

15478664473 is a deficient number, since it is larger than the sum of its proper divisors (248907).

15478664473 is a wasteful number, since it uses less digits than its factorization.

15478664473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248906.

The product of its digits is 13547520, while the sum is 55.

The spelling of 15478664473 in words is "fifteen billion, four hundred seventy-eight million, six hundred sixty-four thousand, four hundred seventy-three".