478717643021 has 4 divisors (see below), whose sum is σ = 483365387232. Its totient is φ = 474069898812.

The previous prime is 478717643017. The next prime is 478717643029. The reversal of 478717643021 is 120346717874.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 478717643021 - 2² = 478717643017 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 (478717643029) 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, 2323871951 + ... + 2323872156.

It is an arithmetic number, because the mean of its divisors is an integer number (120841346808).

Almost surely, 2^478717643021 is an apocalyptic number.

It is an amenable number.

478717643021 is a deficient number, since it is larger than the sum of its proper divisors (4647744211).

478717643021 is a wasteful number, since it uses less digits than its factorization.

478717643021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4647744210.

The product of its (nonzero) digits is 1580544, while the sum is 50.

The spelling of 478717643021 in words is "four hundred seventy-eight billion, seven hundred seventeen million, six hundred forty-three thousand, twenty-one".