53665645 has 8 divisors (see below), whose sum is σ = 70253280. Its totient is φ = 39029520.

The previous prime is 53665637. The next prime is 53665649. The reversal of 53665645 is 54656635.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 53665645 - 2³ = 53665637 is a prime.

It is a super-3 number, since 3×53665645³ (a number of 24 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 53665598 and 53665607.

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 in 7 ways as a sum of consecutive naturals, for example, 487815 + ... + 487924.

It is an arithmetic number, because the mean of its divisors is an integer number (8781660).

Almost surely, 2^53665645 is an apocalyptic number.

53665645 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

53665645 is a deficient number, since it is larger than the sum of its proper divisors (16587635).

53665645 is a wasteful number, since it uses less digits than its factorization.

53665645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 975755.

The product of its digits is 324000, while the sum is 40.

The square root of 53665645 is about 7325.6839271156. The cubic root of 53665645 is about 377.1945865342.

It can be divided in two parts, 5366 and 5645, that added together give a palindrome (11011).

The spelling of 53665645 in words is "fifty-three million, six hundred sixty-five thousand, six hundred forty-five".