660121442 has 4 divisors (see below), whose sum is σ = 990182166. Its totient is φ = 330060720.

The previous prime is 660121421. The next prime is 660121457. The reversal of 660121442 is 244121066.

660121442 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 499567201 + 160554241 = 22351^2 + 12671^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165030359 + ... + 165030362.

Almost surely, 2^660121442 is an apocalyptic number.

660121442 is a deficient number, since it is larger than the sum of its proper divisors (330060724).

660121442 is a wasteful number, since it uses less digits than its factorization.

660121442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330060723.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 660121442 is about 25692.8286103341. The cubic root of 660121442 is about 870.7121671263.

The spelling of 660121442 in words is "six hundred sixty million, one hundred twenty-one thousand, four hundred forty-two".