126667766621 has 32 divisors (see below), whose sum is σ = 148884894720. Its totient is φ = 106548825600.

The previous prime is 126667766593. The next prime is 126667766647.

126667766621 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 126667766621 - 2⁶ = 126667766557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126667766671) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1547885 + ... + 1627661.

It is an arithmetic number, because the mean of its divisors is an integer number (4652652960).

Almost surely, 2^126667766621 is an apocalyptic number.

126667766621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

126667766621 is a deficient number, since it is larger than the sum of its proper divisors (22217128099).

126667766621 is a wasteful number, since it uses less digits than its factorization.

126667766621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79985.

The product of its digits is 9144576, while the sum is 56.

The spelling of 126667766621 in words is "one hundred twenty-six billion, six hundred sixty-seven million, seven hundred sixty-six thousand, six hundred twenty-one".