16146513661 has 4 divisors (see below), whose sum is σ = 16147337500. Its totient is φ = 16145689824.

The previous prime is 16146513641. The next prime is 16146513667. The reversal of 16146513661 is 16631564161.

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 787868761 + 15358644900 = 28069^2 + 123930^2 .

It is a cyclic number.

It is not a de Polignac number, because 16146513661 - 2¹⁵ = 16146480893 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 (16146513667) 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, 381786 + ... + 421963.

It is an arithmetic number, because the mean of its divisors is an integer number (4036834375).

Almost surely, 2^16146513661 is an apocalyptic number.

It is an amenable number.

16146513661 is a deficient number, since it is larger than the sum of its proper divisors (823839).

16146513661 is an equidigital number, since it uses as much as digits as its factorization.

16146513661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 823838.

The product of its digits is 77760, while the sum is 40.

The spelling of 16146513661 in words is "sixteen billion, one hundred forty-six million, five hundred thirteen thousand, six hundred sixty-one".