646762453 has 2 divisors, whose sum is σ = 646762454. Its totient is φ = 646762452.

The previous prime is 646762439. The next prime is 646762471. The reversal of 646762453 is 354267646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 327139569 + 319622884 = 18087^2 + 17878^2 .

It is a cyclic number.

It is not a de Polignac number, because 646762453 - 2⁵ = 646762421 is a prime.

It is a super-2 number, since 2×646762453² = 836603341221154418, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646760453) 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 as a sum of consecutive naturals, namely, 323381226 + 323381227.

It is an arithmetic number, because the mean of its divisors is an integer number (323381227).

Almost surely, 2^646762453 is an apocalyptic number.

It is an amenable number.

646762453 is a deficient number, since it is larger than the sum of its proper divisors (1).

646762453 is an equidigital number, since it uses as much as digits as its factorization.

646762453 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 725760, while the sum is 43.

The square root of 646762453 is about 25431.5247871613. The cubic root of 646762453 is about 864.7985109902.

The spelling of 646762453 in words is "six hundred forty-six million, seven hundred sixty-two thousand, four hundred fifty-three".