55133661 has 8 divisors (see below), whose sum is σ = 80194464. Its totient is φ = 33414320.

The previous prime is 55133651. The next prime is 55133681. The reversal of 55133661 is 16633155.

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 55133661 - 2⁵ = 55133629 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55133651) 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, 835326 + ... + 835391.

It is an arithmetic number, because the mean of its divisors is an integer number (10024308).

Almost surely, 2^55133661 is an apocalyptic number.

It is an amenable number.

55133661 is a deficient number, since it is larger than the sum of its proper divisors (25060803).

55133661 is a wasteful number, since it uses less digits than its factorization.

55133661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1670731.

The product of its digits is 8100, while the sum is 30.

The square root of 55133661 is about 7425.2044416299. The cubic root of 55133661 is about 380.6030613621.

The spelling of 55133661 in words is "fifty-five million, one hundred thirty-three thousand, six hundred sixty-one".