664560427 has 2 divisors, whose sum is σ = 664560428. Its totient is φ = 664560426.

The previous prime is 664560409. The next prime is 664560451. The reversal of 664560427 is 724065466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 664560427 - 2¹¹ = 664558379 is a prime.

It is a super-2 number, since 2×664560427² = 883281122268844658, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 664560427.

It is not a weakly prime, because it can be changed into another prime (664560527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332280213 + 332280214.

It is an arithmetic number, because the mean of its divisors is an integer number (332280214).

Almost surely, 2^664560427 is an apocalyptic number.

664560427 is a deficient number, since it is larger than the sum of its proper divisors (1).

664560427 is an equidigital number, since it uses as much as digits as its factorization.

664560427 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 241920, while the sum is 40.

The square root of 664560427 is about 25779.0695526429. The cubic root of 664560427 is about 872.6595092644.

The spelling of 664560427 in words is "six hundred sixty-four million, five hundred sixty thousand, four hundred twenty-seven".