78322672669 has 2 divisors, whose sum is σ = 78322672670. Its totient is φ = 78322672668.

The previous prime is 78322672643. The next prime is 78322672733. The reversal of 78322672669 is 96627622387.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58679248644 + 19643424025 = 242238^2 + 140155^2 .

It is a cyclic number.

It is not a de Polignac number, because 78322672669 - 2¹⁷ = 78322541597 is a prime.

It is a super-2 number, since 2×78322672669² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78322672619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39161336334 + 39161336335.

It is an arithmetic number, because the mean of its divisors is an integer number (39161336335).

Almost surely, 2^78322672669 is an apocalyptic number.

It is an amenable number.

78322672669 is a deficient number, since it is larger than the sum of its proper divisors (1).

78322672669 is an equidigital number, since it uses as much as digits as its factorization.

78322672669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18289152, while the sum is 58.

The spelling of 78322672669 in words is "seventy-eight billion, three hundred twenty-two million, six hundred seventy-two thousand, six hundred sixty-nine".