16523442091 has 16 divisors (see below), whose sum is σ = 18426578688. Its totient is φ = 14713718400.

The previous prime is 16523442083. The next prime is 16523442097. The reversal of 16523442091 is 19024432561.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 16523442091 - 2³ = 16523442083 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 16523442091.

It is not an unprimeable number, because it can be changed into a prime (16523442097) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63081 + ... + 192421.

It is an arithmetic number, because the mean of its divisors is an integer number (1151661168).

Almost surely, 2^16523442091 is an apocalyptic number.

16523442091 is a deficient number, since it is larger than the sum of its proper divisors (1903136597).

16523442091 is a wasteful number, since it uses less digits than its factorization.

16523442091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129702.

The product of its (nonzero) digits is 51840, while the sum is 37.

The spelling of 16523442091 in words is "sixteen billion, five hundred twenty-three million, four hundred forty-two thousand, ninety-one".