53866661 has 8 divisors (see below), whose sum is σ = 55301400. Its totient is φ = 52437760.

The previous prime is 53866651. The next prime is 53866663. The reversal of 53866661 is 16666835.

It can be written as a sum of positive squares in 4 ways, for example, as 649636 + 53217025 = 806^2 + 7295^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 53866661 - 2⁶ = 53866597 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53866663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22175 + ... + 24483.

It is an arithmetic number, because the mean of its divisors is an integer number (6912675).

Almost surely, 2^53866661 is an apocalyptic number.

It is an amenable number.

53866661 is a deficient number, since it is larger than the sum of its proper divisors (1434739).

53866661 is a wasteful number, since it uses less digits than its factorization.

53866661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2919.

The product of its digits is 155520, while the sum is 41.

The square root of 53866661 is about 7339.3910510341. The cubic root of 53866661 is about 377.6649537137.

The spelling of 53866661 in words is "fifty-three million, eight hundred sixty-six thousand, six hundred sixty-one".