55111770 has 72 divisors (see below), whose sum is σ = 166698324. Its totient is φ = 12595968.

The previous prime is 55111757. The next prime is 55111781. The reversal of 55111770 is 7711155.

It can be written as a sum of positive squares in 2 ways, for example, as 54952569 + 159201 = 7413^2 + 399^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1839 + ... + 10658.

Almost surely, 2^55111770 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55111770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83349162).

55111770 is an abundant number, since it is smaller than the sum of its proper divisors (111586554).

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

55111770 is a wasteful number, since it uses less digits than its factorization.

55111770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12524 (or 12514 counting only the distinct ones).

The product of its (nonzero) digits is 1225, while the sum is 27.

The square root of 55111770 is about 7423.7301944508. The cubic root of 55111770 is about 380.5526814645.

It can be divided in two parts, 551 and 11770, that added together give a palindrome (12321).

The spelling of 55111770 in words is "fifty-five million, one hundred eleven thousand, seven hundred seventy".