20161521733 has 2 divisors, whose sum is σ = 20161521734. Its totient is φ = 20161521732.

The previous prime is 20161521707. The next prime is 20161521761. The reversal of 20161521733 is 33712516102.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17432713089 + 2728808644 = 132033^2 + 52238^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20161521733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20161521695 and 20161521704.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20161521703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10080760866 + 10080760867.

It is an arithmetic number, because the mean of its divisors is an integer number (10080760867).

Almost surely, 2^20161521733 is an apocalyptic number.

It is an amenable number.

20161521733 is a deficient number, since it is larger than the sum of its proper divisors (1).

20161521733 is an equidigital number, since it uses as much as digits as its factorization.

20161521733 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 31.

The spelling of 20161521733 in words is "twenty billion, one hundred sixty-one million, five hundred twenty-one thousand, seven hundred thirty-three".