120663661 has 4 divisors (see below), whose sum is σ = 127014400. Its totient is φ = 114312924.

The previous prime is 120663649. The next prime is 120663667. The reversal of 120663661 is 166366021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 120663661 - 2¹⁵ = 120630893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120663667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3175341 + ... + 3175378.

It is an arithmetic number, because the mean of its divisors is an integer number (31753600).

Almost surely, 2^120663661 is an apocalyptic number.

It is an amenable number.

120663661 is a deficient number, since it is larger than the sum of its proper divisors (6350739).

120663661 is an equidigital number, since it uses as much as digits as its factorization.

120663661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6350738.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 120663661 is about 10984.7012248855. The cubic root of 120663661 is about 494.1500374739.

The spelling of 120663661 in words is "one hundred twenty million, six hundred sixty-three thousand, six hundred sixty-one".