1565640047 has 2 divisors, whose sum is σ = 1565640048. Its totient is φ = 1565640046.

The previous prime is 1565640001. The next prime is 1565640079. The reversal of 1565640047 is 7400465651.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1565640047 - 2¹⁸ = 1565377903 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1565648047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 782820023 + 782820024.

It is an arithmetic number, because the mean of its divisors is an integer number (782820024).

Almost surely, 2^1565640047 is an apocalyptic number.

1565640047 is a deficient number, since it is larger than the sum of its proper divisors (1).

1565640047 is an equidigital number, since it uses as much as digits as its factorization.

1565640047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 100800, while the sum is 38.

The square root of 1565640047 is about 39568.1696190258. The cubic root of 1565640047 is about 1161.1740113181.

The spelling of 1565640047 in words is "one billion, five hundred sixty-five million, six hundred forty thousand, forty-seven".