126618661 has 8 divisors (see below), whose sum is σ = 138670560. Its totient is φ = 114897072.

The previous prime is 126618649. The next prime is 126618671. The reversal of 126618661 is 166816621.

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

It is not a de Polignac number, because 126618661 - 2²⁵ = 93064229 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 126618661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126618671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81775 + ... + 83308.

It is an arithmetic number, because the mean of its divisors is an integer number (17333820).

Almost surely, 2^126618661 is an apocalyptic number.

It is an amenable number.

126618661 is a deficient number, since it is larger than the sum of its proper divisors (12051899).

126618661 is a wasteful number, since it uses less digits than its factorization.

126618661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165155.

The product of its digits is 20736, while the sum is 37.

The square root of 126618661 is about 11252.4957676064. The cubic root of 126618661 is about 502.1489653306.

The spelling of 126618661 in words is "one hundred twenty-six million, six hundred eighteen thousand, six hundred sixty-one".