126766665 has 24 divisors (see below), whose sum is σ = 220259520. Its totient is φ = 67445664.

The previous prime is 126766663. The next prime is 126766691. The reversal of 126766665 is 566667621.

It is not a de Polignac number, because 126766665 - 2¹ = 126766663 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 126766665.

It is not an unprimeable number, because it can be changed into a prime (126766663) 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, 16756 + ... + 23114.

It is an arithmetic number, because the mean of its divisors is an integer number (9177480).

Almost surely, 2^126766665 is an apocalyptic number.

126766665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

126766665 is a deficient number, since it is larger than the sum of its proper divisors (93492855).

126766665 is a wasteful number, since it uses less digits than its factorization.

126766665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6813 (or 6810 counting only the distinct ones).

The product of its digits is 544320, while the sum is 45.

The square root of 126766665 is about 11259.0703435053. The cubic root of 126766665 is about 502.3445423917.

The spelling of 126766665 in words is "one hundred twenty-six million, seven hundred sixty-six thousand, six hundred sixty-five".