126605661 has 48 divisors (see below), whose sum is σ = 213966144. Its totient is φ = 65995776.

The previous prime is 126605659. The next prime is 126605669. The reversal of 126605661 is 166506621.

It is not a de Polignac number, because 126605661 - 2¹ = 126605659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126605669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 185026 + ... + 185708.

It is an arithmetic number, because the mean of its divisors is an integer number (4457628).

Almost surely, 2^126605661 is an apocalyptic number.

It is an amenable number.

126605661 is a deficient number, since it is larger than the sum of its proper divisors (87360483).

126605661 is a wasteful number, since it uses less digits than its factorization.

126605661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 810 (or 803 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 126605661 is about 11251.9181031502. The cubic root of 126605661 is about 502.1317794490.

The spelling of 126605661 in words is "one hundred twenty-six million, six hundred five thousand, six hundred sixty-one".