16016105991 has 8 divisors (see below), whose sum is σ = 21448882944. Its totient is φ = 10630366520.

The previous prime is 16016105953. The next prime is 16016105999. The reversal of 16016105991 is 19950161061.

It is a happy number.

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 16016105991 - 2⁶ = 16016105927 is a prime.

It is a super-2 number, since 2×16016105991² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16016105999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11758575 + ... + 11759936.

It is an arithmetic number, because the mean of its divisors is an integer number (2681110368).

Almost surely, 2^16016105991 is an apocalyptic number.

16016105991 is a deficient number, since it is larger than the sum of its proper divisors (5432776953).

16016105991 is a wasteful number, since it uses less digits than its factorization.

16016105991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23518741.

The product of its (nonzero) digits is 14580, while the sum is 39.

The spelling of 16016105991 in words is "sixteen billion, sixteen million, one hundred five thousand, nine hundred ninety-one".