166686703501 has 16 divisors (see below), whose sum is σ = 170695710720. Its totient is φ = 162734140800.

The previous prime is 166686703499. The next prime is 166686703511. The reversal of 166686703501 is 105307686661.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 166686703501 - 2¹ = 166686703499 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166686703511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3273700 + ... + 3324226.

It is an arithmetic number, because the mean of its divisors is an integer number (10668481920).

Almost surely, 2^166686703501 is an apocalyptic number.

It is an amenable number.

166686703501 is a deficient number, since it is larger than the sum of its proper divisors (4009007219).

166686703501 is a wasteful number, since it uses less digits than its factorization.

166686703501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51084.

The product of its (nonzero) digits is 1088640, while the sum is 49.

The spelling of 166686703501 in words is "one hundred sixty-six billion, six hundred eighty-six million, seven hundred three thousand, five hundred one".