782665673 has 2 divisors, whose sum is σ = 782665674. Its totient is φ = 782665672.

The previous prime is 782665633. The next prime is 782665679. The reversal of 782665673 is 376566287.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 516062089 + 266603584 = 22717^2 + 16328^2 .

It is a cyclic number.

It is not a de Polignac number, because 782665673 - 2⁸ = 782665417 is a prime.

It is a super-2 number, since 2×782665673² = 1225131111385085858, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (782665679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 391332836 + 391332837.

It is an arithmetic number, because the mean of its divisors is an integer number (391332837).

Almost surely, 2^782665673 is an apocalyptic number.

It is an amenable number.

782665673 is a deficient number, since it is larger than the sum of its proper divisors (1).

782665673 is an equidigital number, since it uses as much as digits as its factorization.

782665673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2540160, while the sum is 50.

The square root of 782665673 is about 27976.1625853154. The cubic root of 782665673 is about 921.5638465953.

The spelling of 782665673 in words is "seven hundred eighty-two million, six hundred sixty-five thousand, six hundred seventy-three".