664451433 has 6 divisors (see below), whose sum is σ = 959763194. Its totient is φ = 442967616.

The previous prime is 664451423. The next prime is 664451461. The reversal of 664451433 is 334154466.

664451433 is a `hidden beast` number, since 6 + 644 + 5 + 1 + 4 + 3 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 599858064 + 64593369 = 24492^2 + 8037^2 .

It is not a de Polignac number, because 664451433 - 2⁶ = 664451369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664451423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36913960 + ... + 36913977.

Almost surely, 2^664451433 is an apocalyptic number.

It is an amenable number.

664451433 is a deficient number, since it is larger than the sum of its proper divisors (295311761).

664451433 is a wasteful number, since it uses less digits than its factorization.

664451433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73827943 (or 73827940 counting only the distinct ones).

The product of its digits is 103680, while the sum is 36.

The square root of 664451433 is about 25776.9554641350. The cubic root of 664451433 is about 872.6117986038.

The spelling of 664451433 in words is "six hundred sixty-four million, four hundred fifty-one thousand, four hundred thirty-three".