1666796917440 has 112 divisors (see below), whose sum is σ = 5309319197952. Its totient is φ = 443031284736.

The previous prime is 1666796917399. The next prime is 1666796917441. The reversal of 1666796917440 is 447196976661.

It is not an unprimeable number, because it can be changed into a prime (1666796917441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2533044 + ... + 3122483.

It is an arithmetic number, because the mean of its divisors is an integer number (47404635696).

Almost surely, 2^{1666796917440} is an apocalyptic number.

1666796917440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1666796917440 is an abundant number, since it is smaller than the sum of its proper divisors (3642522280512).

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

1666796917440 is a wasteful number, since it uses less digits than its factorization.

1666796917440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5655854 (or 5655844 counting only the distinct ones).

The product of its (nonzero) digits is 82301184, while the sum is 66.

The spelling of 1666796917440 in words is "one trillion, six hundred sixty-six billion, seven hundred ninety-six million, nine hundred seventeen thousand, four hundred forty".