16451506660541 has 4 divisors (see below), whose sum is σ = 16451538354300. Its totient is φ = 16451474966784.

The previous prime is 16451506660499. The next prime is 16451506660549. The reversal of 16451506660541 is 14506660515461.

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 10913739924025 + 5537766736516 = 3303595^2 + 2353246^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16451506660541 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 16451506660541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16451506660549) 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, 15055076 + ... + 16110813.

It is an arithmetic number, because the mean of its divisors is an integer number (4112884588575).

Almost surely, 2^{16451506660541} is an apocalyptic number.

It is an amenable number.

16451506660541 is a deficient number, since it is larger than the sum of its proper divisors (31693759).

16451506660541 is an equidigital number, since it uses as much as digits as its factorization.

16451506660541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31693758.

The product of its (nonzero) digits is 2592000, while the sum is 50.

The spelling of 16451506660541 in words is "sixteen trillion, four hundred fifty-one billion, five hundred six million, six hundred sixty thousand, five hundred forty-one".