53619666 has 32 divisors (see below), whose sum is σ = 117469440. Its totient is φ = 16240896.

The previous prime is 53619611. The next prime is 53619679. The reversal of 53619666 is 66691635.

53619666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6106 + ... + 12021.

It is an arithmetic number, because the mean of its divisors is an integer number (3670920).

Almost surely, 2^53619666 is an apocalyptic number.

53619666 is an abundant number, since it is smaller than the sum of its proper divisors (63849774).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

53619666 is a wasteful number, since it uses less digits than its factorization.

53619666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18178.

The product of its digits is 174960, while the sum is 42.

The square root of 53619666 is about 7322.5450493664. The cubic root of 53619666 is about 377.0868330217.

It can be divided in two parts, 53619 and 666, that added together give a triangular number (54285 = T₃₂₉).

The spelling of 53619666 in words is "fifty-three million, six hundred nineteen thousand, six hundred sixty-six".