16547251331491 has 2 divisors, whose sum is σ = 16547251331492. Its totient is φ = 16547251331490.

The previous prime is 16547251331489. The next prime is 16547251331537. The reversal of 16547251331491 is 19413315274561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16547251331491 - 2¹ = 16547251331489 is a prime.

Together with 16547251331489, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (16547251331411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8273625665745 + 8273625665746.

It is an arithmetic number, because the mean of its divisors is an integer number (8273625665746).

Almost surely, 2^{16547251331491} is an apocalyptic number.

16547251331491 is a deficient number, since it is larger than the sum of its proper divisors (1).

16547251331491 is an equidigital number, since it uses as much as digits as its factorization.

16547251331491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2721600, while the sum is 52.

The spelling of 16547251331491 in words is "sixteen trillion, five hundred forty-seven billion, two hundred fifty-one million, three hundred thirty-one thousand, four hundred ninety-one".