13320019991 has 2 divisors, whose sum is σ = 13320019992. Its totient is φ = 13320019990.

The previous prime is 13320019987. The next prime is 13320020057. The reversal of 13320019991 is 19991002331.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13320019991 - 2² = 13320019987 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13320019961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6660009995 + 6660009996.

It is an arithmetic number, because the mean of its divisors is an integer number (6660009996).

Almost surely, 2^13320019991 is an apocalyptic number.

13320019991 is a deficient number, since it is larger than the sum of its proper divisors (1).

13320019991 is an equidigital number, since it uses as much as digits as its factorization.

13320019991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13122, while the sum is 38.

The spelling of 13320019991 in words is "thirteen billion, three hundred twenty million, nineteen thousand, nine hundred ninety-one".