667087780769 has 2 divisors, whose sum is σ = 667087780770. Its totient is φ = 667087780768.

The previous prime is 667087780763. The next prime is 667087780901. The reversal of 667087780769 is 967087780766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 424925370769 + 242162410000 = 651863^2 + 492100^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667087780769 is a prime.

It is a super-2 number, since 2×667087780769² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (667087780763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333543890384 + 333543890385.

It is an arithmetic number, because the mean of its divisors is an integer number (333543890385).

Almost surely, 2^667087780769 is an apocalyptic number.

It is an amenable number.

667087780769 is a deficient number, since it is larger than the sum of its proper divisors (1).

667087780769 is an equidigital number, since it uses as much as digits as its factorization.

667087780769 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 298722816, while the sum is 71.

The spelling of 667087780769 in words is "six hundred sixty-seven billion, eighty-seven million, seven hundred eighty thousand, seven hundred sixty-nine".