646106473 has 2 divisors, whose sum is σ = 646106474. Its totient is φ = 646106472.

The previous prime is 646106441. The next prime is 646106479. The reversal of 646106473 is 374601646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 630361449 + 15745024 = 25107^2 + 3968^2 .

It is a cyclic number.

It is not a de Polignac number, because 646106473 - 2⁵ = 646106441 is a prime.

It is not a weakly prime, because it can be changed into another prime (646106479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323053236 + 323053237.

It is an arithmetic number, because the mean of its divisors is an integer number (323053237).

Almost surely, 2^646106473 is an apocalyptic number.

It is an amenable number.

646106473 is a deficient number, since it is larger than the sum of its proper divisors (1).

646106473 is an equidigital number, since it uses as much as digits as its factorization.

646106473 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 37.

The square root of 646106473 is about 25418.6245300567. The cubic root of 646106473 is about 864.5060375972.

The spelling of 646106473 in words is "six hundred forty-six million, one hundred six thousand, four hundred seventy-three".