30426440857 has 4 divisors (see below), whose sum is σ = 30463411840. Its totient is φ = 30389469876.

The previous prime is 30426440753. The next prime is 30426440881. The reversal of 30426440857 is 75804462403.

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: 75804462403 = 79 ⋅959550157.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30426440857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30426440357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18484257 + ... + 18485902.

It is an arithmetic number, because the mean of its divisors is an integer number (7615852960).

Almost surely, 2^30426440857 is an apocalyptic number.

It is an amenable number.

30426440857 is a deficient number, since it is larger than the sum of its proper divisors (36970983).

30426440857 is an equidigital number, since it uses as much as digits as its factorization.

30426440857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36970982.

The product of its (nonzero) digits is 645120, while the sum is 43.

The spelling of 30426440857 in words is "thirty billion, four hundred twenty-six million, four hundred forty thousand, eight hundred fifty-seven".