1660051890 has 144 divisors (see below), whose sum is σ = 5040216792. Its totient is φ = 377975808.

The previous prime is 1660051867. The next prime is 1660051919. The reversal of 1660051890 is 981500661.

It can be written as a sum of positive squares in 4 ways, for example, as 690165441 + 969886449 = 26271^2 + 31143^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1485612 + ... + 1486728.

Almost surely, 2^1660051890 is an apocalyptic number.

1660051890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1660051890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2520108396).

1660051890 is an abundant number, since it is smaller than the sum of its proper divisors (3380164902).

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

1660051890 is a wasteful number, since it uses less digits than its factorization.

1660051890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1481 (or 1471 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 1660051890 is about 40743.7343649303. The cubic root of 1660051890 is about 1184.0604848156.

The spelling of 1660051890 in words is "one billion, six hundred sixty million, fifty-one thousand, eight hundred ninety".