646117061 has 2 divisors, whose sum is σ = 646117062. Its totient is φ = 646117060.

The previous prime is 646117049. The next prime is 646117067. The reversal of 646117061 is 160711646.

It is a happy number.

646117061 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 639837025 + 6280036 = 25295^2 + 2506^2 .

It is a cyclic number.

It is not a de Polignac number, because 646117061 - 2⁶ = 646116997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646117067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323058530 + 323058531.

It is an arithmetic number, because the mean of its divisors is an integer number (323058531).

Almost surely, 2^646117061 is an apocalyptic number.

It is an amenable number.

646117061 is a deficient number, since it is larger than the sum of its proper divisors (1).

646117061 is an equidigital number, since it uses as much as digits as its factorization.

646117061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 646117061 is about 25418.8328016847. The cubic root of 646117061 is about 864.5107599045.

The spelling of 646117061 in words is "six hundred forty-six million, one hundred seventeen thousand, sixty-one".