21757166459 has 8 divisors (see below), whose sum is σ = 24968510688. Its totient is φ = 18571616640.

The previous prime is 21757166429. The next prime is 21757166467. The reversal of 21757166459 is 95466175712.

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 21757166459 - 2¹⁶ = 21757100923 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 21757166459.

It is not an unprimeable number, because it can be changed into a prime (21757166419) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6446792 + ... + 6450165.

It is an arithmetic number, because the mean of its divisors is an integer number (3121063836).

Almost surely, 2^21757166459 is an apocalyptic number.

21757166459 is a deficient number, since it is larger than the sum of its proper divisors (3211344229).

21757166459 is a wasteful number, since it uses less digits than its factorization.

21757166459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12897205.

The product of its digits is 3175200, while the sum is 53.

The spelling of 21757166459 in words is "twenty-one billion, seven hundred fifty-seven million, one hundred sixty-six thousand, four hundred fifty-nine".