16631527381 has 8 divisors (see below), whose sum is σ = 19105945664. Its totient is φ = 14181730560.

The previous prime is 16631527357. The next prime is 16631527387. The reversal of 16631527381 is 18372513661.

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 16631527381 - 2⁹ = 16631526869 is a prime.

It is a super-2 number, since 2×16631527381² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16631527387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6153915 + ... + 6156616.

It is an arithmetic number, because the mean of its divisors is an integer number (2388243208).

Almost surely, 2^16631527381 is an apocalyptic number.

It is an amenable number.

16631527381 is a deficient number, since it is larger than the sum of its proper divisors (2474418283).

16631527381 is a wasteful number, since it uses less digits than its factorization.

16631527381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12310731.

The product of its digits is 181440, while the sum is 43.

The spelling of 16631527381 in words is "sixteen billion, six hundred thirty-one million, five hundred twenty-seven thousand, three hundred eighty-one".