664050973 has 2 divisors, whose sum is σ = 664050974. Its totient is φ = 664050972.

The previous prime is 664050967. The next prime is 664050977. The reversal of 664050973 is 379050466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 443439364 + 220611609 = 21058^2 + 14853^2 .

It is a cyclic number.

It is not a de Polignac number, because 664050973 - 2⁹ = 664050461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664050977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332025486 + 332025487.

It is an arithmetic number, because the mean of its divisors is an integer number (332025487).

Almost surely, 2^664050973 is an apocalyptic number.

It is an amenable number.

664050973 is a deficient number, since it is larger than the sum of its proper divisors (1).

664050973 is an equidigital number, since it uses as much as digits as its factorization.

664050973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 136080, while the sum is 40.

The square root of 664050973 is about 25769.1865024878. The cubic root of 664050973 is about 872.4364577989.

The spelling of 664050973 in words is "six hundred sixty-four million, fifty thousand, nine hundred seventy-three".