478688251138 has 4 divisors (see below), whose sum is σ = 718032376710. Its totient is φ = 239344125568.

The previous prime is 478688251133. The next prime is 478688251169. The reversal of 478688251138 is 831152886874.

It is a happy number.

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., 320676436089 + 158011815049 = 566283^2 + 397507^2 .

It is not an unprimeable number, because it can be changed into a prime (478688251133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119672062783 + ... + 119672062786.

Almost surely, 2^478688251138 is an apocalyptic number.

478688251138 is a deficient number, since it is larger than the sum of its proper divisors (239344125572).

478688251138 is a wasteful number, since it uses less digits than its factorization.

478688251138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239344125571.

The product of its digits is 20643840, while the sum is 61.

The spelling of 478688251138 in words is "four hundred seventy-eight billion, six hundred eighty-eight million, two hundred fifty-one thousand, one hundred thirty-eight".