55018722 has 16 divisors (see below), whose sum is σ = 120040992. Its totient is φ = 16672320.

The previous prime is 55018709. The next prime is 55018723. The reversal of 55018722 is 22781055.

It is a self number, because there is not a number n which added to its sum of digits gives 55018722.

It is not an unprimeable number, because it can be changed into a prime (55018723) 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, 416743 + ... + 416874.

It is an arithmetic number, because the mean of its divisors is an integer number (7502562).

Almost surely, 2^55018722 is an apocalyptic number.

55018722 is an abundant number, since it is smaller than the sum of its proper divisors (65022270).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55018722 is a wasteful number, since it uses less digits than its factorization.

55018722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 833633.

The product of its (nonzero) digits is 5600, while the sum is 30.

The square root of 55018722 is about 7417.4606166801. The cubic root of 55018722 is about 380.3383920148.

Adding to 55018722 its reverse (22781055), we get a palindrome (77799777).

The spelling of 55018722 in words is "fifty-five million, eighteen thousand, seven hundred twenty-two".