1660643358 has 64 divisors (see below), whose sum is σ = 3862425600. Its totient is φ = 470676960.

The previous prime is 1660643357. The next prime is 1660643363. The reversal of 1660643358 is 8533460661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1660643357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 90685 + ... + 107447.

It is an arithmetic number, because the mean of its divisors is an integer number (60350400).

Almost surely, 2^1660643358 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1660643358, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1931212800).

1660643358 is an abundant number, since it is smaller than the sum of its proper divisors (2201782242).

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

1660643358 is a wasteful number, since it uses less digits than its factorization.

1660643358 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16877.

The product of its (nonzero) digits is 311040, while the sum is 42.

The square root of 1660643358 is about 40750.9921106223. The cubic root of 1660643358 is about 1184.2010930164.

The spelling of 1660643358 in words is "one billion, six hundred sixty million, six hundred forty-three thousand, three hundred fifty-eight".