55273661 has 4 divisors (see below), whose sum is σ = 55314300. Its totient is φ = 55233024.

The previous prime is 55273649. The next prime is 55273663. The reversal of 55273661 is 16637255.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 29365561 + 25908100 = 5419^2 + 5090^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55273661 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 (55273663) 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, 18206 + ... + 21023.

It is an arithmetic number, because the mean of its divisors is an integer number (13828575).

Almost surely, 2^55273661 is an apocalyptic number.

It is an amenable number.

55273661 is a deficient number, since it is larger than the sum of its proper divisors (40639).

55273661 is a wasteful number, since it uses less digits than its factorization.

55273661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40638.

The product of its digits is 37800, while the sum is 35.

The square root of 55273661 is about 7434.6258143904. The cubic root of 55273661 is about 380.9249421013.

The spelling of 55273661 in words is "fifty-five million, two hundred seventy-three thousand, six hundred sixty-one".