16665687358501 has 8 divisors (see below), whose sum is σ = 16768296138240. Its totient is φ = 16563083033952.

The previous prime is 16665687358493. The next prime is 16665687358513. The reversal of 16665687358501 is 10585378656661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16665687358501 - 2³ = 16665687358493 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 (16665687353501) 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 7 ways as a sum of consecutive naturals, for example, 6552636 + ... + 8733178.

It is an arithmetic number, because the mean of its divisors is an integer number (2096037017280).

Almost surely, 2^{16665687358501} is an apocalyptic number.

It is an amenable number.

16665687358501 is a deficient number, since it is larger than the sum of its proper divisors (102608779739).

16665687358501 is a wasteful number, since it uses less digits than its factorization.

16665687358501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2227595.

The product of its (nonzero) digits is 217728000, while the sum is 67.

The spelling of 16665687358501 in words is "sixteen trillion, six hundred sixty-five billion, six hundred eighty-seven million, three hundred fifty-eight thousand, five hundred one".