16133533937491 has 4 divisors (see below), whose sum is σ = 16314809599800. Its totient is φ = 15952258275184.

The previous prime is 16133533937447. The next prime is 16133533937497. The reversal of 16133533937491 is 19473933533161.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16133533937491 - 2¹⁷ = 16133533806419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16133533937497) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90637831021 + ... + 90637831198.

It is an arithmetic number, because the mean of its divisors is an integer number (4078702399950).

Almost surely, 2^{16133533937491} is an apocalyptic number.

16133533937491 is a deficient number, since it is larger than the sum of its proper divisors (181275662309).

16133533937491 is an equidigital number, since it uses as much as digits as its factorization.

16133533937491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181275662308.

The product of its digits is 16533720, while the sum is 58.

The spelling of 16133533937491 in words is "sixteen trillion, one hundred thirty-three billion, five hundred thirty-three million, nine hundred thirty-seven thousand, four hundred ninety-one".