16421486897 has 2 divisors, whose sum is σ = 16421486898. Its totient is φ = 16421486896.

The previous prime is 16421486819. The next prime is 16421486899. The reversal of 16421486897 is 79868412461.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16118587681 + 302899216 = 126959^2 + 17404^2 .

It is a cyclic number.

It is not a de Polignac number, because 16421486897 - 2¹² = 16421482801 is a prime.

It is a super-3 number, since 3×16421486897³ (a number of 32 digits) contains 333 as substring.

Together with 16421486899, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16421486899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8210743448 + 8210743449.

It is an arithmetic number, because the mean of its divisors is an integer number (8210743449).

Almost surely, 2^16421486897 is an apocalyptic number.

It is an amenable number.

16421486897 is a deficient number, since it is larger than the sum of its proper divisors (1).

16421486897 is an equidigital number, since it uses as much as digits as its factorization.

16421486897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4644864, while the sum is 56.

The spelling of 16421486897 in words is "sixteen billion, four hundred twenty-one million, four hundred eighty-six thousand, eight hundred ninety-seven".