126693396621 has 16 divisors (see below), whose sum is σ = 204757005120. Its totient is φ = 76783876560.

The previous prime is 126693396619. The next prime is 126693396629.

126693396621 is a `hidden beast` number, since 1 + 2 + 6 + 6 + 9 + 3 + 3 + 9 + 6 + 621 = 666.

126693396621 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 126693396621 - 2¹ = 126693396619 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126693396629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 213288250 + ... + 213288843.

It is an arithmetic number, because the mean of its divisors is an integer number (12797312820).

Almost surely, 2^126693396621 is an apocalyptic number.

126693396621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

126693396621 is a deficient number, since it is larger than the sum of its proper divisors (78063608499).

126693396621 is a wasteful number, since it uses less digits than its factorization.

126693396621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426577113 (or 426577107 counting only the distinct ones).

The product of its digits is 3779136, while the sum is 54.

The spelling of 126693396621 in words is "one hundred twenty-six billion, six hundred ninety-three million, three hundred ninety-six thousand, six hundred twenty-one".