1660565191 has 2 divisors, whose sum is σ = 1660565192. Its totient is φ = 1660565190.

The previous prime is 1660565177. The next prime is 1660565197. The reversal of 1660565191 is 1915650661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1660565191 - 2¹³ = 1660556999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1660565197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830282595 + 830282596.

It is an arithmetic number, because the mean of its divisors is an integer number (830282596).

Almost surely, 2^1660565191 is an apocalyptic number.

1660565191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1660565191 is an equidigital number, since it uses as much as digits as its factorization.

1660565191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48600, while the sum is 40.

The square root of 1660565191 is about 40750.0330183915. The cubic root of 1660565191 is about 1184.1825124868.

It can be divided in two parts, 16605 and 65191, that added together give a square (81796 = 286²).

The spelling of 1660565191 in words is "one billion, six hundred sixty million, five hundred sixty-five thousand, one hundred ninety-one".