1660638801 has 16 divisors (see below), whose sum is σ = 2364189696. Its totient is φ = 1034329296.

The previous prime is 1660638799. The next prime is 1660638899. The reversal of 1660638801 is 1088360661.

It is not a de Polignac number, because 1660638801 - 2¹ = 1660638799 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1660638801.

It is not an unprimeable number, because it can be changed into a prime (1660638901) 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 15 ways as a sum of consecutive naturals, for example, 276885 + ... + 282818.

It is an arithmetic number, because the mean of its divisors is an integer number (147761856).

Almost surely, 2^1660638801 is an apocalyptic number.

It is an amenable number.

1660638801 is a deficient number, since it is larger than the sum of its proper divisors (703550895).

1660638801 is a wasteful number, since it uses less digits than its factorization.

1660638801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559772.

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 1660638801 is about 40750.9361978348. The cubic root of 1660638801 is about 1184.2000098198.

The spelling of 1660638801 in words is "one billion, six hundred sixty million, six hundred thirty-eight thousand, eight hundred one".