1660635344 has 80 divisors (see below), whose sum is σ = 3478558608. Its totient is φ = 765198336.

The previous prime is 1660635343. The next prime is 1660635377. The reversal of 1660635344 is 4435360661.

It can be written as a sum of positive squares in 8 ways, for example, as 309337744 + 1351297600 = 17588^2 + 36760^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1660635298 and 1660635307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1660635343) 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, 2981114 + ... + 2981670.

Almost surely, 2^1660635344 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 1660635344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1739279304).

1660635344 is an abundant number, since it is smaller than the sum of its proper divisors (1817923264).

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

1660635344 is a wasteful number, since it uses less digits than its factorization.

1660635344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 792 (or 786 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 38.

The square root of 1660635344 is about 40750.8937816093. The cubic root of 1660635344 is about 1184.1991880914.

The spelling of 1660635344 in words is "one billion, six hundred sixty million, six hundred thirty-five thousand, three hundred forty-four".