1660650091 has 2 divisors, whose sum is σ = 1660650092. Its totient is φ = 1660650090.

The previous prime is 1660650037. The next prime is 1660650127. The reversal of 1660650091 is 1900560661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1660650091 - 2⁹ = 1660649579 is a prime.

It is not a weakly prime, because it can be changed into another prime (1660650001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830325045 + 830325046.

It is an arithmetic number, because the mean of its divisors is an integer number (830325046).

Almost surely, 2^1660650091 is an apocalyptic number.

1660650091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1660650091 is an equidigital number, since it uses as much as digits as its factorization.

1660650091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 1660650091 is about 40751.0747220242. The cubic root of 1660650091 is about 1184.2026934433.

The spelling of 1660650091 in words is "one billion, six hundred sixty million, six hundred fifty thousand, ninety-one".