478447546635557 has 4 divisors (see below), whose sum is σ = 485001622616940. Its totient is φ = 471893470654176.

The previous prime is 478447546635533. The next prime is 478447546635571. The reversal of 478447546635557 is 755536645744874.

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

It can be written as a sum of positive squares in 2 ways, for example, as 352480122998116 + 125967423637441 = 18774454^2 + 11223521^2 .

It is a cyclic number.

It is not a de Polignac number, because 478447546635557 - 2³⁰ = 478446472893733 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 (478447546635577) 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, 3277037990582 + ... + 3277037990727.

It is an arithmetic number, because the mean of its divisors is an integer number (121250405654235).

Almost surely, 2^{478447546635557} is an apocalyptic number.

It is an amenable number.

478447546635557 is a deficient number, since it is larger than the sum of its proper divisors (6554075981383).

478447546635557 is an equidigital number, since it uses as much as digits as its factorization.

478447546635557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6554075981382.

The product of its digits is 47416320000, while the sum is 80.

The spelling of 478447546635557 in words is "four hundred seventy-eight trillion, four hundred forty-seven billion, five hundred forty-six million, six hundred thirty-five thousand, five hundred fifty-seven".