16724423781 has 16 divisors (see below), whose sum is σ = 26682841920. Its totient is φ = 10291952880.

The previous prime is 16724423773. The next prime is 16724423809. The reversal of 16724423781 is 18732442761.

It is not a de Polignac number, because 16724423781 - 2³ = 16724423773 is a prime.

It is a super-2 number, since 2×16724423781² (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 (16724423381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23823615 + ... + 23824316.

It is an arithmetic number, because the mean of its divisors is an integer number (1667677620).

Almost surely, 2^16724423781 is an apocalyptic number.

It is an amenable number.

16724423781 is a deficient number, since it is larger than the sum of its proper divisors (9958418139).

16724423781 is a wasteful number, since it uses less digits than its factorization.

16724423781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47647953 (or 47647947 counting only the distinct ones).

The product of its digits is 451584, while the sum is 45.

The spelling of 16724423781 in words is "sixteen billion, seven hundred twenty-four million, four hundred twenty-three thousand, seven hundred eighty-one".