16993133491 has 2 divisors, whose sum is σ = 16993133492. Its totient is φ = 16993133490.

The previous prime is 16993133389. The next prime is 16993133497. The reversal of 16993133491 is 19433139961.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16993133491 - 2²¹ = 16991036339 is a prime.

It is not a weakly prime, because it can be changed into another prime (16993133497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8496566745 + 8496566746.

It is an arithmetic number, because the mean of its divisors is an integer number (8496566746).

Almost surely, 2^16993133491 is an apocalyptic number.

16993133491 is a deficient number, since it is larger than the sum of its proper divisors (1).

16993133491 is an equidigital number, since it uses as much as digits as its factorization.

16993133491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 472392, while the sum is 49.

The spelling of 16993133491 in words is "sixteen billion, nine hundred ninety-three million, one hundred thirty-three thousand, four hundred ninety-one".