16400664523 has 4 divisors (see below), whose sum is σ = 16749614880. Its totient is φ = 16051714168.

The previous prime is 16400664521. The next prime is 16400664547. The reversal of 16400664523 is 32546600461.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16400664523 - 2¹ = 16400664521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16400664521) 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, 174475108 + ... + 174475201.

It is an arithmetic number, because the mean of its divisors is an integer number (4187403720).

Almost surely, 2^16400664523 is an apocalyptic number.

16400664523 is a deficient number, since it is larger than the sum of its proper divisors (348950357).

16400664523 is an equidigital number, since it uses as much as digits as its factorization.

16400664523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348950356.

The product of its (nonzero) digits is 103680, while the sum is 37.

The spelling of 16400664523 in words is "sixteen billion, four hundred million, six hundred sixty-four thousand, five hundred twenty-three".