16506426653 has 4 divisors (see below), whose sum is σ = 16506765660. Its totient is φ = 16506087648.

The previous prime is 16506426619. The next prime is 16506426679. The reversal of 16506426653 is 35662460561.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4971237049 + 11535189604 = 70507^2 + 107402^2 .

It is a cyclic number.

It is not a de Polignac number, because 16506426653 - 2²⁶ = 16439317789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16506423653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81098 + ... + 198971.

It is an arithmetic number, because the mean of its divisors is an integer number (4126691415).

Almost surely, 2^16506426653 is an apocalyptic number.

It is an amenable number.

16506426653 is a deficient number, since it is larger than the sum of its proper divisors (339007).

16506426653 is an equidigital number, since it uses as much as digits as its factorization.

16506426653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339006.

The product of its (nonzero) digits is 777600, while the sum is 44.

The spelling of 16506426653 in words is "sixteen billion, five hundred six million, four hundred twenty-six thousand, six hundred fifty-three".