30355947155561 has 2 divisors, whose sum is σ = 30355947155562. Its totient is φ = 30355947155560.

The previous prime is 30355947155539. The next prime is 30355947155563. The reversal of 30355947155561 is 16555174955303.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25889779240000 + 4466167915561 = 5088200^2 + 2113331^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30355947155561 is a prime.

It is a super-2 number, since 2×30355947155561² (a number of 28 digits) contains 22 as substring.

Together with 30355947155563, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 30355947155561.

It is not a weakly prime, because it can be changed into another prime (30355947155563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15177973577780 + 15177973577781.

It is an arithmetic number, because the mean of its divisors is an integer number (15177973577781).

Almost surely, 2^{30355947155561} is an apocalyptic number.

It is an amenable number.

30355947155561 is a deficient number, since it is larger than the sum of its proper divisors (1).

30355947155561 is an equidigital number, since it uses as much as digits as its factorization.

30355947155561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42525000, while the sum is 59.

The spelling of 30355947155561 in words is "thirty trillion, three hundred fifty-five billion, nine hundred forty-seven million, one hundred fifty-five thousand, five hundred sixty-one".