551641660 has 48 divisors (see below), whose sum is σ = 1211547456. Its totient is φ = 210586112.

The previous prime is 551641639. The next prime is 551641667. The reversal of 551641660 is 66146155.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551641667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 255144 + ... + 257296.

It is an arithmetic number, because the mean of its divisors is an integer number (25240572).

Almost surely, 2^551641660 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 551641660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (605773728).

551641660 is an abundant number, since it is smaller than the sum of its proper divisors (659905796).

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

551641660 is a wasteful number, since it uses less digits than its factorization.

551641660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2742 (or 2740 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 551641660 is about 23487.0530292755. The cubic root of 551641660 is about 820.1356408573.

The spelling of 551641660 in words is "five hundred fifty-one million, six hundred forty-one thousand, six hundred sixty".