18756927457 has 2 divisors, whose sum is σ = 18756927458. Its totient is φ = 18756927456.

The previous prime is 18756927437. The next prime is 18756927493. The reversal of 18756927457 is 75472965781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14971724881 + 3785202576 = 122359^2 + 61524^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18756927457 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18756927395 and 18756927404.

It is not a weakly prime, because it can be changed into another prime (18756927437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9378463728 + 9378463729.

It is an arithmetic number, because the mean of its divisors is an integer number (9378463729).

Almost surely, 2^18756927457 is an apocalyptic number.

It is an amenable number.

18756927457 is a deficient number, since it is larger than the sum of its proper divisors (1).

18756927457 is an equidigital number, since it uses as much as digits as its factorization.

18756927457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29635200, while the sum is 61.

The spelling of 18756927457 in words is "eighteen billion, seven hundred fifty-six million, nine hundred twenty-seven thousand, four hundred fifty-seven".