55650821 has 4 divisors (see below), whose sum is σ = 55692000. Its totient is φ = 55609644.

The previous prime is 55650781. The next prime is 55650827. The reversal of 55650821 is 12805655.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55650821 - 2¹⁴ = 55634437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55650827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18491 + ... + 21288.

It is an arithmetic number, because the mean of its divisors is an integer number (13923000).

Almost surely, 2^55650821 is an apocalyptic number.

It is an amenable number.

55650821 is a deficient number, since it is larger than the sum of its proper divisors (41179).

55650821 is a wasteful number, since it uses less digits than its factorization.

55650821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41178.

The product of its (nonzero) digits is 12000, while the sum is 32.

The square root of 55650821 is about 7459.9477880210. The cubic root of 55650821 is about 381.7893930589.

The spelling of 55650821 in words is "fifty-five million, six hundred fifty thousand, eight hundred twenty-one".