16656709685 has 32 divisors (see below), whose sum is σ = 24939712512. Its totient is φ = 10375260480.

The previous prime is 16656709681. The next prime is 16656709697. The reversal of 16656709685 is 58690765661.

It is not a de Polignac number, because 16656709685 - 2² = 16656709681 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16656709681) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 494594 + ... + 527196.

It is an arithmetic number, because the mean of its divisors is an integer number (779366016).

Almost surely, 2^16656709685 is an apocalyptic number.

It is an amenable number.

16656709685 is a deficient number, since it is larger than the sum of its proper divisors (8283002827).

16656709685 is a wasteful number, since it uses less digits than its factorization.

16656709685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33953.

The product of its (nonzero) digits is 16329600, while the sum is 59.

The spelling of 16656709685 in words is "sixteen billion, six hundred fifty-six million, seven hundred nine thousand, six hundred eighty-five".