16515252389 has 2 divisors, whose sum is σ = 16515252390. Its totient is φ = 16515252388.

The previous prime is 16515252349. The next prime is 16515252431. The reversal of 16515252389 is 98325251561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14359228900 + 2156023489 = 119830^2 + 46433^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16515252389 is a prime.

It is a super-2 number, since 2×16515252389² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16515252349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8257626194 + 8257626195.

It is an arithmetic number, because the mean of its divisors is an integer number (8257626195).

Almost surely, 2^16515252389 is an apocalyptic number.

It is an amenable number.

16515252389 is a deficient number, since it is larger than the sum of its proper divisors (1).

16515252389 is an equidigital number, since it uses as much as digits as its factorization.

16515252389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648000, while the sum is 47.

The spelling of 16515252389 in words is "sixteen billion, five hundred fifteen million, two hundred fifty-two thousand, three hundred eighty-nine".