16447345881 has 16 divisors (see below), whose sum is σ = 22335951360. Its totient is φ = 10762571520.

The previous prime is 16447345879. The next prime is 16447345883. The reversal of 16447345881 is 18854374461.

It is an interprime number because it is at equal distance from previous prime (16447345879) and next prime (16447345883).

It is not a de Polignac number, because 16447345881 - 2¹ = 16447345879 is a prime.

It is a super-2 number, since 2×16447345881² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16447345883) 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, 6160 + ... + 181473.

It is an arithmetic number, because the mean of its divisors is an integer number (1395996960).

Almost surely, 2^16447345881 is an apocalyptic number.

It is an amenable number.

16447345881 is a deficient number, since it is larger than the sum of its proper divisors (5888605479).

16447345881 is a wasteful number, since it uses less digits than its factorization.

16447345881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188176.

The product of its digits is 2580480, while the sum is 51.

The spelling of 16447345881 in words is "sixteen billion, four hundred forty-seven million, three hundred forty-five thousand, eight hundred eighty-one".