126666813 has 64 divisors (see below), whose sum is σ = 224985600. Its totient is φ = 62770176.

The previous prime is 126666791. The next prime is 126666821. The reversal of 126666813 is 318666621.

It is not a de Polignac number, because 126666813 - 2⁵ = 126666781 is a prime.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126666853) 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, 227131 + ... + 227687.

It is an arithmetic number, because the mean of its divisors is an integer number (3515400).

Almost surely, 2^126666813 is an apocalyptic number.

126666813 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

126666813 is a deficient number, since it is larger than the sum of its proper divisors (98318787).

126666813 is a wasteful number, since it uses less digits than its factorization.

126666813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611 (or 597 counting only the distinct ones).

The product of its digits is 62208, while the sum is 39.

The square root of 126666813 is about 11254.6351784498. The cubic root of 126666813 is about 502.2126115903.

The spelling of 126666813 in words is "one hundred twenty-six million, six hundred sixty-six thousand, eight hundred thirteen".