1666985914503 has 96 divisors (see below), whose sum is σ = 3001954615296. Its totient is φ = 867936466944.

The previous prime is 1666985914471. The next prime is 1666985914567. The reversal of 1666985914503 is 3054195896661.

It is not a de Polignac number, because 1666985914503 - 2⁵ = 1666985914471 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666985919503) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 30399276 + ... + 30454062.

It is an arithmetic number, because the mean of its divisors is an integer number (31270360576).

Almost surely, 2^{1666985914503} is an apocalyptic number.

1666985914503 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1666985914503 is a deficient number, since it is larger than the sum of its proper divisors (1334968700793).

1666985914503 is a wasteful number, since it uses less digits than its factorization.

1666985914503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55293 (or 55290 counting only the distinct ones).

The product of its (nonzero) digits is 41990400, while the sum is 63.

The spelling of 1666985914503 in words is "one trillion, six hundred sixty-six billion, nine hundred eighty-five million, nine hundred fourteen thousand, five hundred three".