55267663721 has 4 divisors (see below), whose sum is σ = 55299410244. Its totient is φ = 55235917200.

The previous prime is 55267663709. The next prime is 55267663727. The reversal of 55267663721 is 12736676255.

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 3117547225 + 52150116496 = 55835^2 + 228364^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55267663721 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55267663721.

It is not an unprimeable number, because it can be changed into a prime (55267663727) 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, 15870650 + ... + 15874131.

It is an arithmetic number, because the mean of its divisors is an integer number (13824852561).

Almost surely, 2^55267663721 is an apocalyptic number.

It is an amenable number.

55267663721 is a deficient number, since it is larger than the sum of its proper divisors (31746523).

55267663721 is a wasteful number, since it uses less digits than its factorization.

55267663721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31746522.

The product of its digits is 3175200, while the sum is 50.

The spelling of 55267663721 in words is "fifty-five billion, two hundred sixty-seven million, six hundred sixty-three thousand, seven hundred twenty-one".