53665646 has 4 divisors (see below), whose sum is σ = 80498472. Its totient is φ = 26832822.

The previous prime is 53665637. The next prime is 53665649. The reversal of 53665646 is 64656635.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64656635 = 5 ⋅12931327.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53665649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13416410 + ... + 13416413.

It is an arithmetic number, because the mean of its divisors is an integer number (20124618).

Almost surely, 2^53665646 is an apocalyptic number.

53665646 is a deficient number, since it is larger than the sum of its proper divisors (26832826).

53665646 is a wasteful number, since it uses less digits than its factorization.

53665646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26832825.

The product of its digits is 388800, while the sum is 41.

The square root of 53665646 is about 7325.6839953686. The cubic root of 53665646 is about 377.1945888770.

The spelling of 53665646 in words is "fifty-three million, six hundred sixty-five thousand, six hundred forty-six".