30355797817 has 2 divisors, whose sum is σ = 30355797818. Its totient is φ = 30355797816.

The previous prime is 30355797799. The next prime is 30355797851. The reversal of 30355797817 is 71879755303.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22719834361 + 7635963456 = 150731^2 + 87384^2 .

It is an emirp because it is prime and its reverse (71879755303) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30355797817 is a prime.

It is a super-2 number, since 2×30355797817² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (30355797217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15177898908 + 15177898909.

It is an arithmetic number, because the mean of its divisors is an integer number (15177898909).

Almost surely, 2^30355797817 is an apocalyptic number.

It is an amenable number.

30355797817 is a deficient number, since it is larger than the sum of its proper divisors (1).

30355797817 is an equidigital number, since it uses as much as digits as its factorization.

30355797817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5556600, while the sum is 55.

The spelling of 30355797817 in words is "thirty billion, three hundred fifty-five million, seven hundred ninety-seven thousand, eight hundred seventeen".