126666303666621 has 24 divisors (see below), whose sum is σ = 183579671192544. Its totient is φ = 77628596478720.

The previous prime is 126666303666613. The next prime is 126666303666629.

126666303666621 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (126666303666613) and next prime (126666303666629).

It is not a de Polignac number, because 126666303666621 - 2³ = 126666303666613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126666303666629) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1698767790 + ... + 1698842351.

It is an arithmetic number, because the mean of its divisors is an integer number (7649152966356).

Almost surely, 2^{126666303666621} is an apocalyptic number.

It is an amenable number.

126666303666621 is a deficient number, since it is larger than the sum of its proper divisors (56913367525923).

126666303666621 is a wasteful number, since it uses less digits than its factorization.

126666303666621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3397610221 (or 3397610204 counting only the distinct ones).

The product of its (nonzero) digits is 60466176, while the sum is 60.

The spelling of 126666303666621 in words is "one hundred twenty-six trillion, six hundred sixty-six billion, three hundred three million, six hundred sixty-six thousand, six hundred twenty-one".