478725597421 has 4 divisors (see below), whose sum is σ = 478947129244. Its totient is φ = 478504065600.

The previous prime is 478725597419. The next prime is 478725597461. The reversal of 478725597421 is 124795527874.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124795527874 = 2 ⋅62397763937.

It can be written as a sum of positive squares in 2 ways, for example, as 391531775625 + 87193821796 = 625725^2 + 295286^2 .

It is a cyclic number.

It is not a de Polignac number, because 478725597421 - 2¹ = 478725597419 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 478725597421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (478725597461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110762670 + ... + 110766991.

It is an arithmetic number, because the mean of its divisors is an integer number (119736782311).

Almost surely, 2^478725597421 is an apocalyptic number.

It is an amenable number.

478725597421 is a deficient number, since it is larger than the sum of its proper divisors (221531823).

478725597421 is a wasteful number, since it uses less digits than its factorization.

478725597421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221531822.

The product of its digits is 39513600, while the sum is 61.

The spelling of 478725597421 in words is "four hundred seventy-eight billion, seven hundred twenty-five million, five hundred ninety-seven thousand, four hundred twenty-one".