16661254733 has 2 divisors, whose sum is σ = 16661254734. Its totient is φ = 16661254732.

The previous prime is 16661254693. The next prime is 16661254807. The reversal of 16661254733 is 33745216661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10388297929 + 6272956804 = 101923^2 + 79202^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16661254733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16661254133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8330627366 + 8330627367.

It is an arithmetic number, because the mean of its divisors is an integer number (8330627367).

Almost surely, 2^16661254733 is an apocalyptic number.

It is an amenable number.

16661254733 is a deficient number, since it is larger than the sum of its proper divisors (1).

16661254733 is an equidigital number, since it uses as much as digits as its factorization.

16661254733 is an evil number, because the sum of its binary digits is even.

The product of its digits is 544320, while the sum is 44.

The spelling of 16661254733 in words is "sixteen billion, six hundred sixty-one million, two hundred fifty-four thousand, seven hundred thirty-three".