14995806521 has 2 divisors, whose sum is σ = 14995806522. Its totient is φ = 14995806520.

The previous prime is 14995806509. The next prime is 14995806557. The reversal of 14995806521 is 12560859941.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8679530896 + 6316275625 = 93164^2 + 79475^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-14995806521 is a prime.

It is a super-2 number, since 2×14995806521² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 14995806521.

It is not a weakly prime, because it can be changed into another prime (14995806571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7497903260 + 7497903261.

It is an arithmetic number, because the mean of its divisors is an integer number (7497903261).

Almost surely, 2^14995806521 is an apocalyptic number.

It is an amenable number.

14995806521 is a deficient number, since it is larger than the sum of its proper divisors (1).

14995806521 is an equidigital number, since it uses as much as digits as its factorization.

14995806521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 777600, while the sum is 50.

The spelling of 14995806521 in words is "fourteen billion, nine hundred ninety-five million, eight hundred six thousand, five hundred twenty-one".