1660640661700 has 54 divisors (see below), whose sum is σ = 3767080272074. Its totient is φ = 635375537280.

The previous prime is 1660640661623. The next prime is 1660640661737. The reversal of 1660640661700 is 71660460661.

It can be written as a sum of positive squares in 3 ways, for example, as 324988926084 + 1335651735616 = 570078^2 + 1155704^2 .

It is an unprimeable number.

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 17 ways as a sum of consecutive naturals, for example, 15643137 + ... + 15748936.

Almost surely, 2^{1660640661700} is an apocalyptic number.

1660640661700 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1660640661700 is an abundant number, since it is smaller than the sum of its proper divisors (2106439610374).

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

1660640661700 is a wasteful number, since it uses less digits than its factorization.

1660640661700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31392133 (or 31392103 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 43.

The spelling of 1660640661700 in words is "one trillion, six hundred sixty billion, six hundred forty million, six hundred sixty-one thousand, seven hundred".