1666672289940 has 384 divisors, whose sum is σ = 5528967413760. Its totient is φ = 367261120512.

The previous prime is 1666672289923. The next prime is 1666672289987. The reversal of 1666672289940 is 499822766661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 714389014 + ... + 714391346.

It is an arithmetic number, because the mean of its divisors is an integer number (14398352640).

Almost surely, 2^{1666672289940} is an apocalyptic number.

1666672289940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1666672289940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2764483706880).

1666672289940 is an abundant number, since it is smaller than the sum of its proper divisors (3862295123820).

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

1666672289940 is a wasteful number, since it uses less digits than its factorization.

1666672289940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2951 (or 2949 counting only the distinct ones).

The product of its (nonzero) digits is 94058496, while the sum is 66.

The spelling of 1666672289940 in words is "one trillion, six hundred sixty-six billion, six hundred seventy-two million, two hundred eighty-nine thousand, nine hundred forty".