1660421000 has 64 divisors (see below), whose sum is σ = 4440458880. Its totient is φ = 569284800.

The previous prime is 1660420999. The next prime is 1660421017. The reversal of 1660421000 is 1240661.

It is a happy number.

It is a super-3 number, since 3×1660421000³ (a number of 29 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111602 + ... + 125601.

It is an arithmetic number, because the mean of its divisors is an integer number (69382170).

Almost surely, 2^1660421000 is an apocalyptic number.

1660421000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1660421000 is an abundant number, since it is smaller than the sum of its proper divisors (2780037880).

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

1660421000 is a wasteful number, since it uses less digits than its factorization.

1660421000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237231 (or 237217 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 1660421000 is about 40748.2637666932. The cubic root of 1660421000 is about 1184.1482363250.

Adding to 1660421000 its reverse (1240661), we get a palindrome (1661661661).

The spelling of 1660421000 in words is "one billion, six hundred sixty million, four hundred twenty-one thousand".