64520040478 has 8 divisors (see below), whose sum is σ = 100117304280. Its totient is φ = 31147605720.

The previous prime is 64520040461. The next prime is 64520040479. The reversal of 64520040478 is 87404002546.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 64520040478.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64520040479) 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 in 3 ways as a sum of consecutive naturals, for example, 556207188 + ... + 556207303.

It is an arithmetic number, because the mean of its divisors is an integer number (12514663035).

Almost surely, 2^64520040478 is an apocalyptic number.

64520040478 is a deficient number, since it is larger than the sum of its proper divisors (35597263802).

64520040478 is a wasteful number, since it uses less digits than its factorization.

64520040478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1112414522.

The product of its (nonzero) digits is 215040, while the sum is 40.

The spelling of 64520040478 in words is "sixty-four billion, five hundred twenty million, forty thousand, four hundred seventy-eight".