1666516546635 has 96 divisors (see below), whose sum is σ = 2810660029632. Its totient is φ = 843029053440.

The previous prime is 1666516546621. The next prime is 1666516546661. The reversal of 1666516546635 is 5366456156661.

It is not a de Polignac number, because 1666516546635 - 2¹² = 1666516542539 is a prime.

It is a super-2 number, since 2×1666516546635² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 167635765 + ... + 167645705.

It is an arithmetic number, because the mean of its divisors is an integer number (29277708642).

Almost surely, 2^{1666516546635} is an apocalyptic number.

1666516546635 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1666516546635 is a deficient number, since it is larger than the sum of its proper divisors (1144143482997).

1666516546635 is a wasteful number, since it uses less digits than its factorization.

1666516546635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10241 (or 10212 counting only the distinct ones).

The product of its digits is 69984000, while the sum is 60.

The spelling of 1666516546635 in words is "one trillion, six hundred sixty-six billion, five hundred sixteen million, five hundred forty-six thousand, six hundred thirty-five".