30787909447681 has 4 divisors (see below), whose sum is σ = 30792740445652. Its totient is φ = 30783078449712.

The previous prime is 30787909447667. The next prime is 30787909447717. The reversal of 30787909447681 is 18674490978703.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13913765373456 + 16874144074225 = 3730116^2 + 4107815^2 .

It is a cyclic number.

It is not a de Polignac number, because 30787909447681 - 2¹¹ = 30787909445633 is a prime.

It is a super-2 number, since 2×30787909447681² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30787909447621) 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, 2415489426 + ... + 2415502171.

It is an arithmetic number, because the mean of its divisors is an integer number (7698185111413).

Almost surely, 2^{30787909447681} is an apocalyptic number.

It is an amenable number.

30787909447681 is a deficient number, since it is larger than the sum of its proper divisors (4830997971).

30787909447681 is an equidigital number, since it uses as much as digits as its factorization.

30787909447681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4830997970.

The product of its (nonzero) digits is 512096256, while the sum is 73.

The spelling of 30787909447681 in words is "thirty trillion, seven hundred eighty-seven billion, nine hundred nine million, four hundred forty-seven thousand, six hundred eighty-one".