11781391759 has 8 divisors (see below), whose sum is σ = 11908767920. Its totient is φ = 11654136576.

The previous prime is 11781391747. The next prime is 11781391771. The reversal of 11781391759 is 95719318711.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (11781391747) and next prime (11781391771).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11781391759 - 2¹³ = 11781383567 is a prime.

It is a super-2 number, since 2×11781391759² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11781391789) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172897 + ... + 231205.

It is an arithmetic number, because the mean of its divisors is an integer number (1488595990).

Almost surely, 2^11781391759 is an apocalyptic number.

11781391759 is a deficient number, since it is larger than the sum of its proper divisors (127376161).

11781391759 is an equidigital number, since it uses as much as digits as its factorization.

11781391759 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60489.

The product of its digits is 476280, while the sum is 52.

The spelling of 11781391759 in words is "eleven billion, seven hundred eighty-one million, three hundred ninety-one thousand, seven hundred fifty-nine".