126320661 has 16 divisors (see below), whose sum is σ = 189937600. Its totient is φ = 82955664.

The previous prime is 126320657. The next prime is 126320671. The reversal of 126320661 is 166023621.

It is not a de Polignac number, because 126320661 - 2² = 126320657 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126320641) 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 15 ways as a sum of consecutive naturals, for example, 33106 + ... + 36723.

It is an arithmetic number, because the mean of its divisors is an integer number (11871100).

Almost surely, 2^126320661 is an apocalyptic number.

It is an amenable number.

126320661 is a deficient number, since it is larger than the sum of its proper divisors (63616939).

126320661 is an equidigital number, since it uses as much as digits as its factorization.

126320661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69905 (or 69899 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 126320661 is about 11239.2464605061. The cubic root of 126320661 is about 501.7547160726.

The spelling of 126320661 in words is "one hundred twenty-six million, three hundred twenty thousand, six hundred sixty-one".