638574208247 has 2 divisors, whose sum is σ = 638574208248. Its totient is φ = 638574208246.

The previous prime is 638574208229. The next prime is 638574208273. The reversal of 638574208247 is 742802475836.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 638574208247 - 2¹⁶ = 638574142711 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 638574208192 and 638574208201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (638574208147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319287104123 + 319287104124.

It is an arithmetic number, because the mean of its divisors is an integer number (319287104124).

Almost surely, 2^638574208247 is an apocalyptic number.

638574208247 is a deficient number, since it is larger than the sum of its proper divisors (1).

638574208247 is an equidigital number, since it uses as much as digits as its factorization.

638574208247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18063360, while the sum is 56.

The spelling of 638574208247 in words is "six hundred thirty-eight billion, five hundred seventy-four million, two hundred eight thousand, two hundred forty-seven".