1666061472920 has 64 divisors (see below), whose sum is σ = 4072720871520. Its totient is φ = 609717233664.

The previous prime is 1666061472899. The next prime is 1666061472949. The reversal of 1666061472920 is 292741606661.

It is a congruent number.

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, 14118074 + ... + 14235593.

Almost surely, 2^{1666061472920} is an apocalyptic number.

1666061472920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1666061472920 is an abundant number, since it is smaller than the sum of its proper divisors (2406659398600).

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

1666061472920 is a wasteful number, since it uses less digits than its factorization.

1666061472920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28353804 (or 28353800 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 50.

The spelling of 1666061472920 in words is "one trillion, six hundred sixty-six billion, sixty-one million, four hundred seventy-two thousand, nine hundred twenty".