646451627 has 2 divisors, whose sum is σ = 646451628. Its totient is φ = 646451626.

The previous prime is 646451599. The next prime is 646451629. The reversal of 646451627 is 726154646.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 646451627 - 2¹⁴ = 646435243 is a prime.

Together with 646451629, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (646451629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323225813 + 323225814.

It is an arithmetic number, because the mean of its divisors is an integer number (323225814).

Almost surely, 2^646451627 is an apocalyptic number.

646451627 is a deficient number, since it is larger than the sum of its proper divisors (1).

646451627 is an equidigital number, since it uses as much as digits as its factorization.

646451627 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 41.

The square root of 646451627 is about 25425.4130153278. The cubic root of 646451627 is about 864.6599516509.

The spelling of 646451627 in words is "six hundred forty-six million, four hundred fifty-one thousand, six hundred twenty-seven".