664578480478 has 32 divisors (see below), whose sum is σ = 1164130704000. Its totient is φ = 281331565920.

The previous prime is 664578480463. The next prime is 664578480493. The reversal of 664578480478 is 874084875466.

It is an interprime number because it is at equal distance from previous prime (664578480463) and next prime (664578480493).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13449073 + ... + 13498396.

It is an arithmetic number, because the mean of its divisors is an integer number (36379084500).

Almost surely, 2^664578480478 is an apocalyptic number.

664578480478 is a deficient number, since it is larger than the sum of its proper divisors (499552223522).

664578480478 is a wasteful number, since it uses less digits than its factorization.

664578480478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26947560.

The product of its (nonzero) digits is 289013760, while the sum is 67.

The spelling of 664578480478 in words is "six hundred sixty-four billion, five hundred seventy-eight million, four hundred eighty thousand, four hundred seventy-eight".