16815692489 has 2 divisors, whose sum is σ = 16815692490. Its totient is φ = 16815692488.

The previous prime is 16815692473. The next prime is 16815692507. The reversal of 16815692489 is 98429651861.

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., 16481424400 + 334268089 = 128380^2 + 18283^2 .

It is a cyclic number.

It is not a de Polignac number, because 16815692489 - 2⁴ = 16815692473 is a prime.

It is a super-2 number, since 2×16815692489² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16815692459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8407846244 + 8407846245.

It is an arithmetic number, because the mean of its divisors is an integer number (8407846245).

Almost surely, 2^16815692489 is an apocalyptic number.

It is an amenable number.

16815692489 is a deficient number, since it is larger than the sum of its proper divisors (1).

16815692489 is an equidigital number, since it uses as much as digits as its factorization.

16815692489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7464960, while the sum is 59.

The spelling of 16815692489 in words is "sixteen billion, eight hundred fifteen million, six hundred ninety-two thousand, four hundred eighty-nine".