16445279475749 has 8 divisors (see below), whose sum is σ = 16459053303000. Its totient is φ = 16431511320576.

The previous prime is 16445279475733. The next prime is 16445279475769. The reversal of 16445279475749 is 94757497254461.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 173680562500 + 16271598913249 = 416750^2 + 4033807^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 16445279475749 - 2⁴ = 16445279475733 is a prime.

It is a super-2 number, since 2×16445279475749² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16445279475769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4393049 + ... + 7224225.

It is an arithmetic number, because the mean of its divisors is an integer number (2057381662875).

Almost surely, 2^{16445279475749} is an apocalyptic number.

It is an amenable number.

16445279475749 is a deficient number, since it is larger than the sum of its proper divisors (13773827251).

16445279475749 is a wasteful number, since it uses less digits than its factorization.

16445279475749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2836039.

The product of its digits is 2133734400, while the sum is 74.

The spelling of 16445279475749 in words is "sixteen trillion, four hundred forty-five billion, two hundred seventy-nine million, four hundred seventy-five thousand, seven hundred forty-nine".