55311660 has 144 divisors (see below), whose sum is σ = 183456000. Its totient is φ = 13950144.

The previous prime is 55311653. The next prime is 55311667. The reversal of 55311660 is 6611355.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (55311653) and next prime (55311667).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (55311667) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 92041 + ... + 92639.

It is an arithmetic number, because the mean of its divisors is an integer number (1274000).

Almost surely, 2^55311660 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55311660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91728000).

55311660 is an abundant number, since it is smaller than the sum of its proper divisors (128144340).

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

55311660 is a wasteful number, since it uses less digits than its factorization.

55311660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642 (or 628 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 55311660 is about 7437.1809175251. The cubic root of 55311660 is about 381.0122136329.

The spelling of 55311660 in words is "fifty-five million, three hundred eleven thousand, six hundred sixty".