16645140373 has 4 divisors (see below), whose sum is σ = 16647856128. Its totient is φ = 16642424620.

The previous prime is 16645140349. The next prime is 16645140431. The reversal of 16645140373 is 37304154661.

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, and also an emirpimes, since its reverse is a distinct semiprime: 37304154661 = 40973 ⋅910457.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16645140373 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16645140073) 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, 1348663 + ... + 1360948.

It is an arithmetic number, because the mean of its divisors is an integer number (4161964032).

Almost surely, 2^16645140373 is an apocalyptic number.

It is an amenable number.

16645140373 is a deficient number, since it is larger than the sum of its proper divisors (2715755).

16645140373 is an equidigital number, since it uses as much as digits as its factorization.

16645140373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2715754.

The product of its (nonzero) digits is 181440, while the sum is 40.

The spelling of 16645140373 in words is "sixteen billion, six hundred forty-five million, one hundred forty thousand, three hundred seventy-three".