664225477 has 2 divisors, whose sum is σ = 664225478. Its totient is φ = 664225476.

The previous prime is 664225459. The next prime is 664225493. The reversal of 664225477 is 774522466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 565203076 + 99022401 = 23774^2 + 9951^2 .

It is a cyclic number.

It is not a de Polignac number, because 664225477 - 2¹¹ = 664223429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664225277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332112738 + 332112739.

It is an arithmetic number, because the mean of its divisors is an integer number (332112739).

Almost surely, 2^664225477 is an apocalyptic number.

It is an amenable number.

664225477 is a deficient number, since it is larger than the sum of its proper divisors (1).

664225477 is an equidigital number, since it uses as much as digits as its factorization.

664225477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 564480, while the sum is 43.

The square root of 664225477 is about 25772.5721843979. The cubic root of 664225477 is about 872.5128727750.

The spelling of 664225477 in words is "six hundred sixty-four million, two hundred twenty-five thousand, four hundred seventy-seven".