55765021 has 4 divisors (see below), whose sum is σ = 60054652. Its totient is φ = 51475392.

The previous prime is 55764991. The next prime is 55765027. The reversal of 55765021 is 12056755.

55765021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12056755 = 5 ⋅2411351.

It can be written as a sum of positive squares in 2 ways, for example, as 38007225 + 17757796 = 6165^2 + 4214^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55765021 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 (55765027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2144796 + ... + 2144821.

It is an arithmetic number, because the mean of its divisors is an integer number (15013663).

Almost surely, 2^55765021 is an apocalyptic number.

It is an amenable number.

55765021 is a deficient number, since it is larger than the sum of its proper divisors (4289631).

55765021 is a wasteful number, since it uses less digits than its factorization.

55765021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4289630.

The product of its (nonzero) digits is 10500, while the sum is 31.

The square root of 55765021 is about 7467.5980743476. The cubic root of 55765021 is about 382.0503688962.

The spelling of 55765021 in words is "fifty-five million, seven hundred sixty-five thousand, twenty-one".