669764243081 has 2 divisors, whose sum is σ = 669764243082. Its totient is φ = 669764243080.

The previous prime is 669764243041. The next prime is 669764243153. The reversal of 669764243081 is 180342467966.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 422448001600 + 247316241481 = 649960^2 + 497309^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-669764243081 is a prime.

It is a super-2 number, since 2×669764243081² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (669764243041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334882121540 + 334882121541.

It is an arithmetic number, because the mean of its divisors is an integer number (334882121541).

Almost surely, 2^669764243081 is an apocalyptic number.

It is an amenable number.

669764243081 is a deficient number, since it is larger than the sum of its proper divisors (1).

669764243081 is an equidigital number, since it uses as much as digits as its factorization.

669764243081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10450944, while the sum is 56.

The spelling of 669764243081 in words is "six hundred sixty-nine billion, seven hundred sixty-four million, two hundred forty-three thousand, eighty-one".