16506110657 has 4 divisors (see below), whose sum is σ = 16506637056. Its totient is φ = 16505584260.

The previous prime is 16506110581. The next prime is 16506110681. The reversal of 16506110657 is 75601160561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16506110657 - 2¹⁶ = 16506045121 is a prime.

It is a super-2 number, since 2×16506110657² (a number of 21 digits) contains 22 as substring.

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 16506110657.

It is not an unprimeable number, because it can be changed into a prime (16506119657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 212969 + ... + 279942.

It is an arithmetic number, because the mean of its divisors is an integer number (4126659264).

Almost surely, 2^16506110657 is an apocalyptic number.

It is an amenable number.

16506110657 is a deficient number, since it is larger than the sum of its proper divisors (526399).

16506110657 is an equidigital number, since it uses as much as digits as its factorization.

16506110657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526398.

The product of its (nonzero) digits is 37800, while the sum is 38.

The spelling of 16506110657 in words is "sixteen billion, five hundred six million, one hundred ten thousand, six hundred fifty-seven".