15361945861 has 2 divisors, whose sum is σ = 15361945862. Its totient is φ = 15361945860.

The previous prime is 15361945843. The next prime is 15361945901. The reversal of 15361945861 is 16854916351.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8755344900 + 6606600961 = 93570^2 + 81281^2 .

It is a cyclic number.

It is not a de Polignac number, because 15361945861 - 2¹¹ = 15361943813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15361945811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7680972930 + 7680972931.

It is an arithmetic number, because the mean of its divisors is an integer number (7680972931).

Almost surely, 2^15361945861 is an apocalyptic number.

It is an amenable number.

15361945861 is a deficient number, since it is larger than the sum of its proper divisors (1).

15361945861 is an equidigital number, since it uses as much as digits as its factorization.

15361945861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 777600, while the sum is 49.

The spelling of 15361945861 in words is "fifteen billion, three hundred sixty-one million, nine hundred forty-five thousand, eight hundred sixty-one".