671655653 has 2 divisors, whose sum is σ = 671655654. Its totient is φ = 671655652.

The previous prime is 671655623. The next prime is 671655659. The reversal of 671655653 is 356556176.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 596971489 + 74684164 = 24433^2 + 8642^2 .

It is a cyclic number.

It is not a de Polignac number, because 671655653 - 2¹² = 671651557 is a prime.

It is a super-2 number, since 2×671655653² = 902242632413712818, which contains 22 as substring.

It is a congruent number.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335827826 + 335827827.

It is an arithmetic number, because the mean of its divisors is an integer number (335827827).

Almost surely, 2^671655653 is an apocalyptic number.

It is an amenable number.

671655653 is a deficient number, since it is larger than the sum of its proper divisors (1).

671655653 is an equidigital number, since it uses as much as digits as its factorization.

671655653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 567000, while the sum is 44.

The square root of 671655653 is about 25916.3202056156. The cubic root of 671655653 is about 875.7541918724.

The spelling of 671655653 in words is "six hundred seventy-one million, six hundred fifty-five thousand, six hundred fifty-three".