16491369897 has 6 divisors (see below), whose sum is σ = 23820867642. Its totient is φ = 10994246592.

The previous prime is 16491369893. The next prime is 16491369901. The reversal of 16491369897 is 79896319461.

16491369897 is a `hidden beast` number, since 1 + 6 + 491 + 3 + 69 + 89 + 7 = 666.

It is an interprime number because it is at equal distance from previous prime (16491369893) and next prime (16491369901).

It can be written as a sum of positive squares in only one way, i.e., 15719141376 + 772228521 = 125376^2 + 27789^2 .

It is not a de Polignac number, because 16491369897 - 2² = 16491369893 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16491369893) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 916187208 + ... + 916187225.

It is an arithmetic number, because the mean of its divisors is an integer number (3970144607).

Almost surely, 2^16491369897 is an apocalyptic number.

It is an amenable number.

16491369897 is a deficient number, since it is larger than the sum of its proper divisors (7329497745).

16491369897 is a wasteful number, since it uses less digits than its factorization.

16491369897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1832374439 (or 1832374436 counting only the distinct ones).

The product of its digits is 17635968, while the sum is 63.

The spelling of 16491369897 in words is "sixteen billion, four hundred ninety-one million, three hundred sixty-nine thousand, eight hundred ninety-seven".