671759993 has 2 divisors, whose sum is σ = 671759994. Its totient is φ = 671759992.

The previous prime is 671759969. The next prime is 671760013. The reversal of 671759993 is 399957176.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 499835449 + 171924544 = 22357^2 + 13112^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-671759993 is a prime.

It is a super-2 number, since 2×671759993² = 902522976390720098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (671759593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335879996 + 335879997.

It is an arithmetic number, because the mean of its divisors is an integer number (335879997).

Almost surely, 2^671759993 is an apocalyptic number.

It is an amenable number.

671759993 is a deficient number, since it is larger than the sum of its proper divisors (1).

671759993 is an equidigital number, since it uses as much as digits as its factorization.

671759993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3214890, while the sum is 56.

The square root of 671759993 is about 25918.3331447067. Note that the first 3 decimals coincide. The cubic root of 671759993 is about 875.7995382542.

The spelling of 671759993 in words is "six hundred seventy-one million, seven hundred fifty-nine thousand, nine hundred ninety-three".