53509966 has 24 divisors (see below), whose sum is σ = 86614920. Its totient is φ = 24716016.

The previous prime is 53509957. The next prime is 53509969. The reversal of 53509966 is 66990535.

It is a happy number.

It is a super-2 number, since 2×53509966² = 5726632922642312, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53509969) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 328201 + ... + 328363.

It is an arithmetic number, because the mean of its divisors is an integer number (3608955).

Almost surely, 2^53509966 is an apocalyptic number.

53509966 is a deficient number, since it is larger than the sum of its proper divisors (33104954).

53509966 is a wasteful number, since it uses less digits than its factorization.

53509966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400 (or 237 counting only the distinct ones).

The product of its (nonzero) digits is 218700, while the sum is 43.

The square root of 53509966 is about 7315.0506491753. The cubic root of 53509966 is about 376.8294979108.

The spelling of 53509966 in words is "fifty-three million, five hundred nine thousand, nine hundred sixty-six".