16721245737 has 18 divisors (see below), whose sum is σ = 28096243578. Its totient is φ = 9554997312.

The previous prime is 16721245711. The next prime is 16721245787. The reversal of 16721245737 is 73754212761.

16721245737 is a `hidden beast` number, since 1 + 6 + 72 + 1 + 2 + 4 + 573 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 15226572816 + 1494672921 = 123396^2 + 38661^2 .

It is not a de Polignac number, because 16721245737 - 2⁸ = 16721245481 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16721245692 and 16721245701.

It is not an unprimeable number, because it can be changed into a prime (16721245787) 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 17 ways as a sum of consecutive naturals, for example, 18957888 + ... + 18958769.

It is an arithmetic number, because the mean of its divisors is an integer number (1560902421).

Almost surely, 2^16721245737 is an apocalyptic number.

It is an amenable number.

16721245737 is a deficient number, since it is larger than the sum of its proper divisors (11374997841).

16721245737 is a wasteful number, since it uses less digits than its factorization.

16721245737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37916677 (or 37916667 counting only the distinct ones).

The product of its digits is 493920, while the sum is 45.

The spelling of 16721245737 in words is "sixteen billion, seven hundred twenty-one million, two hundred forty-five thousand, seven hundred thirty-seven".