15061408721 has 2 divisors, whose sum is σ = 15061408722. Its totient is φ = 15061408720.

The previous prime is 15061408693. The next prime is 15061408727. The reversal of 15061408721 is 12780416051.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9546267025 + 5515141696 = 97705^2 + 74264^2 .

It is a cyclic number.

It is not a de Polignac number, because 15061408721 - 2¹⁴ = 15061392337 is a prime.

It is a super-2 number, since 2×15061408721² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (15061408727) 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 as a sum of consecutive naturals, namely, 7530704360 + 7530704361.

It is an arithmetic number, because the mean of its divisors is an integer number (7530704361).

Almost surely, 2^15061408721 is an apocalyptic number.

It is an amenable number.

15061408721 is a deficient number, since it is larger than the sum of its proper divisors (1).

15061408721 is an equidigital number, since it uses as much as digits as its factorization.

15061408721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13440, while the sum is 35.

The spelling of 15061408721 in words is "fifteen billion, sixty-one million, four hundred eight thousand, seven hundred twenty-one".