671655619 has 2 divisors, whose sum is σ = 671655620. Its totient is φ = 671655618.

The previous prime is 671655599. The next prime is 671655623. The reversal of 671655619 is 916556176.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 671655619 - 2⁹ = 671655107 is a prime.

It is a super-2 number, since 2×671655619² = 902242541068546322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (671655659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335827809 + 335827810.

It is an arithmetic number, because the mean of its divisors is an integer number (335827810).

Almost surely, 2^671655619 is an apocalyptic number.

671655619 is a deficient number, since it is larger than the sum of its proper divisors (1).

671655619 is an equidigital number, since it uses as much as digits as its factorization.

671655619 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 340200, while the sum is 46.

The square root of 671655619 is about 25916.3195496583. The cubic root of 671655619 is about 875.7541770952.

The spelling of 671655619 in words is "six hundred seventy-one million, six hundred fifty-five thousand, six hundred nineteen".