126699666249 has 64 divisors (see below), whose sum is σ = 188270449920. Its totient is φ = 75308590080.

The previous prime is 126699666199. The next prime is 126699666251. The reversal of 126699666249 is 942666996621.

It is not a de Polignac number, because 126699666249 - 2³³ = 118109731657 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 126699666249.

It is not an unprimeable number, because it can be changed into a prime (126699666259) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 34158207 + ... + 34161915.

It is an arithmetic number, because the mean of its divisors is an integer number (2941725780).

Almost surely, 2^126699666249 is an apocalyptic number.

It is an amenable number.

126699666249 is a deficient number, since it is larger than the sum of its proper divisors (61570783671).

126699666249 is a wasteful number, since it uses less digits than its factorization.

126699666249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4042.

The product of its digits is 90699264, while the sum is 66.

The spelling of 126699666249 in words is "one hundred twenty-six billion, six hundred ninety-nine million, six hundred sixty-six thousand, two hundred forty-nine".