18958561357 has 2 divisors, whose sum is σ = 18958561358. Its totient is φ = 18958561356.

The previous prime is 18958561343. The next prime is 18958561393. The reversal of 18958561357 is 75316585981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18894976681 + 63584676 = 137459^2 + 7974^2 .

It is a cyclic number.

It is not a de Polignac number, because 18958561357 - 2⁷ = 18958561229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18958511357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9479280678 + 9479280679.

It is an arithmetic number, because the mean of its divisors is an integer number (9479280679).

Almost surely, 2^18958561357 is an apocalyptic number.

It is an amenable number.

18958561357 is a deficient number, since it is larger than the sum of its proper divisors (1).

18958561357 is an equidigital number, since it uses as much as digits as its factorization.

18958561357 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072000, while the sum is 58.

The spelling of 18958561357 in words is "eighteen billion, nine hundred fifty-eight million, five hundred sixty-one thousand, three hundred fifty-seven".