30656239993 has 4 divisors (see below), whose sum is σ = 30675294580. Its totient is φ = 30637185408.

The previous prime is 30656239937. The next prime is 30656239997. The reversal of 30656239993 is 39993265603.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39993265603 = 1699 ⋅23539297.

It can be written as a sum of positive squares in 2 ways, for example, as 13066318864 + 17589921129 = 114308^2 + 132627^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30656239993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30656239997) 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, 9524880 + ... + 9528097.

It is an arithmetic number, because the mean of its divisors is an integer number (7668823645).

Almost surely, 2^30656239993 is an apocalyptic number.

It is an amenable number.

30656239993 is a deficient number, since it is larger than the sum of its proper divisors (19054587).

30656239993 is a wasteful number, since it uses less digits than its factorization.

30656239993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19054586.

The product of its (nonzero) digits is 7085880, while the sum is 55.

The spelling of 30656239993 in words is "thirty billion, six hundred fifty-six million, two hundred thirty-nine thousand, nine hundred ninety-three".