1665051659 has 2 divisors, whose sum is σ = 1665051660. Its totient is φ = 1665051658.

The previous prime is 1665051611. The next prime is 1665051667. The reversal of 1665051659 is 9561505661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1665051659 - 2⁸ = 1665051403 is a prime.

It is not a weakly prime, because it can be changed into another prime (1665057659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832525829 + 832525830.

It is an arithmetic number, because the mean of its divisors is an integer number (832525830).

Almost surely, 2^1665051659 is an apocalyptic number.

1665051659 is a deficient number, since it is larger than the sum of its proper divisors (1).

1665051659 is an equidigital number, since it uses as much as digits as its factorization.

1665051659 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 243000, while the sum is 44.

The square root of 1665051659 is about 40805.0445288325. The cubic root of 1665051659 is about 1185.2480170694.

The spelling of 1665051659 in words is "one billion, six hundred sixty-five million, fifty-one thousand, six hundred fifty-nine".