6669602086949 has 2 divisors, whose sum is σ = 6669602086950. Its totient is φ = 6669602086948.

The previous prime is 6669602086943. The next prime is 6669602086963. The reversal of 6669602086949 is 9496802069666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3913314804100 + 2756287282849 = 1978210^2 + 1660207^2 .

It is a cyclic number.

It is not a de Polignac number, because 6669602086949 - 2²⁸ = 6669333651493 is a prime.

It is a super-2 number, since 2×6669602086949² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6669602086943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3334801043474 + 3334801043475.

It is an arithmetic number, because the mean of its divisors is an integer number (3334801043475).

Almost surely, 2^{6669602086949} is an apocalyptic number.

It is an amenable number.

6669602086949 is a deficient number, since it is larger than the sum of its proper divisors (1).

6669602086949 is an equidigital number, since it uses as much as digits as its factorization.

6669602086949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 362797056, while the sum is 71.

The spelling of 6669602086949 in words is "six trillion, six hundred sixty-nine billion, six hundred two million, eighty-six thousand, nine hundred forty-nine".