53666909 has 16 divisors (see below), whose sum is σ = 59811696. Its totient is φ = 47923200.

The previous prime is 53666897. The next prime is 53666923. The reversal of 53666909 is 90966635.

It can be written as a sum of positive squares in 8 ways, for example, as 55225 + 53611684 = 235^2 + 7322^2 .

It is a cyclic number.

It is not a de Polignac number, because 53666909 - 2¹² = 53662813 is a prime.

It is a super-2 number, since 2×53666909² = 5760274243228562, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 53666909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53666929) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24749 + ... + 26829.

It is an arithmetic number, because the mean of its divisors is an integer number (3738231).

Almost surely, 2^53666909 is an apocalyptic number.

It is an amenable number.

53666909 is a deficient number, since it is larger than the sum of its proper divisors (6144787).

53666909 is a wasteful number, since it uses less digits than its factorization.

53666909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2176.

The product of its (nonzero) digits is 262440, while the sum is 44.

The square root of 53666909 is about 7325.7701984160. The cubic root of 53666909 is about 377.1975478962.

The spelling of 53666909 in words is "fifty-three million, six hundred sixty-six thousand, nine hundred nine".