18747307457 has 2 divisors, whose sum is σ = 18747307458. Its totient is φ = 18747307456.

The previous prime is 18747307387. The next prime is 18747307477. The reversal of 18747307457 is 75470374781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17677297936 + 1070009521 = 132956^2 + 32711^2 .

It is a cyclic number.

It is not a de Polignac number, because 18747307457 - 2¹⁶ = 18747241921 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18747307399 and 18747307408.

It is not a weakly prime, because it can be changed into another prime (18747307477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9373653728 + 9373653729.

It is an arithmetic number, because the mean of its divisors is an integer number (9373653729).

Almost surely, 2^18747307457 is an apocalyptic number.

It is an amenable number.

18747307457 is a deficient number, since it is larger than the sum of its proper divisors (1).

18747307457 is an equidigital number, since it uses as much as digits as its factorization.

18747307457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4609920, while the sum is 53.

The spelling of 18747307457 in words is "eighteen billion, seven hundred forty-seven million, three hundred seven thousand, four hundred fifty-seven".