16426620565 has 8 divisors (see below), whose sum is σ = 19714505688. Its totient is φ = 13139589120.

The previous prime is 16426620557. The next prime is 16426620571. The reversal of 16426620565 is 56502662461.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 373223761 + 16053396804 = 19319^2 + 126702^2 .

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

It is not a de Polignac number, because 16426620565 - 2³ = 16426620557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 170292 + ... + 248701.

It is an arithmetic number, because the mean of its divisors is an integer number (2464313211).

Almost surely, 2^16426620565 is an apocalyptic number.

It is an amenable number.

16426620565 is a deficient number, since it is larger than the sum of its proper divisors (3287885123).

16426620565 is an equidigital number, since it uses as much as digits as its factorization.

16426620565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426839.

The product of its (nonzero) digits is 518400, while the sum is 43.

The spelling of 16426620565 in words is "sixteen billion, four hundred twenty-six million, six hundred twenty thousand, five hundred sixty-five".