126661643 has 8 divisors (see below), whose sum is σ = 128605488. Its totient is φ = 124723584.

The previous prime is 126661627. The next prime is 126661697. The reversal of 126661643 is 346166621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 126661643 - 2⁴ = 126661627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126661603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65255 + ... + 67167.

It is an arithmetic number, because the mean of its divisors is an integer number (16075686).

Almost surely, 2^126661643 is an apocalyptic number.

126661643 is a deficient number, since it is larger than the sum of its proper divisors (1943845).

126661643 is an equidigital number, since it uses as much as digits as its factorization.

126661643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2893.

The product of its digits is 31104, while the sum is 35.

The square root of 126661643 is about 11254.4054929614. The cubic root of 126661643 is about 502.2057787705.

The spelling of 126661643 in words is "one hundred twenty-six million, six hundred sixty-one thousand, six hundred forty-three".