21689162585 has 8 divisors (see below), whose sum is σ = 26044990656. Its totient is φ = 17339333040.

The previous prime is 21689162569. The next prime is 21689162609. The reversal of 21689162585 is 58526198612.

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

It is not a de Polignac number, because 21689162585 - 2⁴ = 21689162569 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1491671 + ... + 1506140.

It is an arithmetic number, because the mean of its divisors is an integer number (3255623832).

Almost surely, 2^21689162585 is an apocalyptic number.

It is an amenable number.

21689162585 is a deficient number, since it is larger than the sum of its proper divisors (4355828071).

21689162585 is a wasteful number, since it uses less digits than its factorization.

21689162585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2999263.

The product of its digits is 2073600, while the sum is 53.

The spelling of 21689162585 in words is "twenty-one billion, six hundred eighty-nine million, one hundred sixty-two thousand, five hundred eighty-five".