13765512991 has 2 divisors, whose sum is σ = 13765512992. Its totient is φ = 13765512990.

The previous prime is 13765512973. The next prime is 13765512997. The reversal of 13765512991 is 19921556731.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13765512991 - 2¹³ = 13765504799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13765512997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6882756495 + 6882756496.

It is an arithmetic number, because the mean of its divisors is an integer number (6882756496).

Almost surely, 2^13765512991 is an apocalyptic number.

13765512991 is a deficient number, since it is larger than the sum of its proper divisors (1).

13765512991 is an equidigital number, since it uses as much as digits as its factorization.

13765512991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 510300, while the sum is 49.

The spelling of 13765512991 in words is "thirteen billion, seven hundred sixty-five million, five hundred twelve thousand, nine hundred ninety-one".