16591406217918 has 64 divisors (see below), whose sum is σ = 38122192829952. Its totient is φ = 4715532656640.

The previous prime is 16591406217917. The next prime is 16591406217937. The reversal of 16591406217918 is 81971260419561.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16591406217913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 143264305 + ... + 143380067.

It is an arithmetic number, because the mean of its divisors is an integer number (595659262968).

Almost surely, 2^{16591406217918} is an apocalyptic number.

16591406217918 is an abundant number, since it is smaller than the sum of its proper divisors (21530786612034).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16591406217918 is a wasteful number, since it uses less digits than its factorization.

16591406217918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133649.

The product of its (nonzero) digits is 6531840, while the sum is 60.

The spelling of 16591406217918 in words is "sixteen trillion, five hundred ninety-one billion, four hundred six million, two hundred seventeen thousand, nine hundred eighteen".