18257207447 has 2 divisors, whose sum is σ = 18257207448. Its totient is φ = 18257207446.

The previous prime is 18257207431. The next prime is 18257207473. The reversal of 18257207447 is 74470275281.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18257207447 - 2⁴ = 18257207431 is a prime.

It is a super-4 number, since 4×18257207447⁴ (a number of 42 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18257207497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9128603723 + 9128603724.

It is an arithmetic number, because the mean of its divisors is an integer number (9128603724).

Almost surely, 2^18257207447 is an apocalyptic number.

18257207447 is a deficient number, since it is larger than the sum of its proper divisors (1).

18257207447 is an equidigital number, since it uses as much as digits as its factorization.

18257207447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 878080, while the sum is 47.

The spelling of 18257207447 in words is "eighteen billion, two hundred fifty-seven million, two hundred seven thousand, four hundred forty-seven".