786820920671 has 2 divisors, whose sum is σ = 786820920672. Its totient is φ = 786820920670.

The previous prime is 786820920667. The next prime is 786820920709. The reversal of 786820920671 is 176029028687.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 786820920671 - 2² = 786820920667 is a prime.

It is a super-2 number, since 2×786820920671² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (786820920371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 393410460335 + 393410460336.

It is an arithmetic number, because the mean of its divisors is an integer number (393410460336).

Almost surely, 2^786820920671 is an apocalyptic number.

786820920671 is a deficient number, since it is larger than the sum of its proper divisors (1).

786820920671 is an equidigital number, since it uses as much as digits as its factorization.

786820920671 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4064256, while the sum is 56.

The spelling of 786820920671 in words is "seven hundred eighty-six billion, eight hundred twenty million, nine hundred twenty thousand, six hundred seventy-one".