16640072737 has 2 divisors, whose sum is σ = 16640072738. Its totient is φ = 16640072736.

The previous prime is 16640072723. The next prime is 16640072741. The reversal of 16640072737 is 73727004661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13641305616 + 2998767121 = 116796^2 + 54761^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16640072737 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16640072693 and 16640072702.

It is not a weakly prime, because it can be changed into another prime (16640072797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8320036368 + 8320036369.

It is an arithmetic number, because the mean of its divisors is an integer number (8320036369).

Almost surely, 2^16640072737 is an apocalyptic number.

It is an amenable number.

16640072737 is a deficient number, since it is larger than the sum of its proper divisors (1).

16640072737 is an equidigital number, since it uses as much as digits as its factorization.

16640072737 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 296352, while the sum is 43.

The spelling of 16640072737 in words is "sixteen billion, six hundred forty million, seventy-two thousand, seven hundred thirty-seven".