667564125749 has 2 divisors, whose sum is σ = 667564125750. Its totient is φ = 667564125748.

The previous prime is 667564125743. The next prime is 667564125769. The reversal of 667564125749 is 947521465766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 542005164100 + 125558961649 = 736210^2 + 354343^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667564125749 is a prime.

It is a super-2 number, since 2×667564125749² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 667564125691 and 667564125700.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667564125743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333782062874 + 333782062875.

It is an arithmetic number, because the mean of its divisors is an integer number (333782062875).

Almost surely, 2^667564125749 is an apocalyptic number.

It is an amenable number.

667564125749 is a deficient number, since it is larger than the sum of its proper divisors (1).

667564125749 is an equidigital number, since it uses as much as digits as its factorization.

667564125749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 76204800, while the sum is 62.

The spelling of 667564125749 in words is "six hundred sixty-seven billion, five hundred sixty-four million, one hundred twenty-five thousand, seven hundred forty-nine".