11708328781 has 4 divisors (see below), whose sum is σ = 11729733952. Its totient is φ = 11686923612.

The previous prime is 11708328763. The next prime is 11708328817. The reversal of 11708328781 is 18782380711.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18782380711 = 463 ⋅40566697.

It is a cyclic number.

It is not a de Polignac number, because 11708328781 - 2¹¹ = 11708326733 is a prime.

It is a super-2 number, since 2×11708328781² (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 (11708328761) 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, 10701765 + ... + 10702858.

It is an arithmetic number, because the mean of its divisors is an integer number (2932433488).

Almost surely, 2^11708328781 is an apocalyptic number.

It is an amenable number.

11708328781 is a deficient number, since it is larger than the sum of its proper divisors (21405171).

11708328781 is an equidigital number, since it uses as much as digits as its factorization.

11708328781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21405170.

The product of its (nonzero) digits is 150528, while the sum is 46.

The spelling of 11708328781 in words is "eleven billion, seven hundred eight million, three hundred twenty-eight thousand, seven hundred eighty-one".