1666988198670 has 32 divisors (see below), whose sum is σ = 4000832364960. Its totient is φ = 444523443200.

The previous prime is 1666988198669. The next prime is 1666988198693. The reversal of 1666988198670 is 768918896661.

It is a junction number, because it is equal to n+sod(n) for n = 1666988198592 and 1666988198601.

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, 1777270 + ... + 2548070.

It is an arithmetic number, because the mean of its divisors is an integer number (125026011405).

Almost surely, 2^{1666988198670} is an apocalyptic number.

1666988198670 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1666988198670 is an abundant number, since it is smaller than the sum of its proper divisors (2333844166290).

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

1666988198670 is a wasteful number, since it uses less digits than its factorization.

1666988198670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 842900.

The product of its (nonzero) digits is 376233984, while the sum is 75.

The spelling of 1666988198670 in words is "one trillion, six hundred sixty-six billion, nine hundred eighty-eight million, one hundred ninety-eight thousand, six hundred seventy".