16665260623 has 4 divisors (see below), whose sum is σ = 18180284328. Its totient is φ = 15150236920.

The previous prime is 16665260609. The next prime is 16665260671. The reversal of 16665260623 is 32606256661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16665260623 - 2²⁵ = 16631706191 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16665260623.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16665260323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 757511836 + ... + 757511857.

It is an arithmetic number, because the mean of its divisors is an integer number (4545071082).

Almost surely, 2^16665260623 is an apocalyptic number.

16665260623 is a deficient number, since it is larger than the sum of its proper divisors (1515023705).

16665260623 is a wasteful number, since it uses less digits than its factorization.

16665260623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1515023704.

The product of its (nonzero) digits is 466560, while the sum is 43.

The spelling of 16665260623 in words is "sixteen billion, six hundred sixty-five million, two hundred sixty thousand, six hundred twenty-three".