47478685447 has 4 divisors (see below), whose sum is σ = 47482049560. Its totient is φ = 47475321336.

The previous prime is 47478685411. The next prime is 47478685489. The reversal of 47478685447 is 74458687474.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47478685447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47478685147) 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, 1660797 + ... + 1689142.

It is an arithmetic number, because the mean of its divisors is an integer number (11870512390).

Almost surely, 2^47478685447 is an apocalyptic number.

47478685447 is a deficient number, since it is larger than the sum of its proper divisors (3364113).

47478685447 is a wasteful number, since it uses less digits than its factorization.

47478685447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3364112.

The product of its digits is 168591360, while the sum is 64.

The spelling of 47478685447 in words is "forty-seven billion, four hundred seventy-eight million, six hundred eighty-five thousand, four hundred forty-seven".