53191566 has 20 divisors (see below), whose sum is σ = 119188872. Its totient is φ = 17730468.

The previous prime is 53191561. The next prime is 53191577. The reversal of 53191566 is 66519135.

53191566 is a `hidden beast` number, since 5 + 3 + 1 + 91 + 566 = 666.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 53191566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53191561) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 164010 + ... + 164333.

Almost surely, 2^53191566 is an apocalyptic number.

53191566 is an abundant number, since it is smaller than the sum of its proper divisors (65997306).

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

53191566 is a wasteful number, since it uses less digits than its factorization.

53191566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328357 (or 328348 counting only the distinct ones).

The product of its digits is 24300, while the sum is 36.

The square root of 53191566 is about 7293.2548289498. The cubic root of 53191566 is about 376.0805951799.

The spelling of 53191566 in words is "fifty-three million, one hundred ninety-one thousand, five hundred sixty-six".