16531361257 has 4 divisors (see below), whose sum is σ = 16537338496. Its totient is φ = 16525384020.

The previous prime is 16531361237. The next prime is 16531361263. The reversal of 16531361257 is 75216313561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16531361257 - 2⁷ = 16531361129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16531361237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2984469 + ... + 2990002.

It is an arithmetic number, because the mean of its divisors is an integer number (4134334624).

Almost surely, 2^16531361257 is an apocalyptic number.

It is an amenable number.

16531361257 is a deficient number, since it is larger than the sum of its proper divisors (5977239).

16531361257 is an equidigital number, since it uses as much as digits as its factorization.

16531361257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5977238.

The product of its digits is 113400, while the sum is 40.

The spelling of 16531361257 in words is "sixteen billion, five hundred thirty-one million, three hundred sixty-one thousand, two hundred fifty-seven".