1665051667 has 2 divisors, whose sum is σ = 1665051668. Its totient is φ = 1665051666.

The previous prime is 1665051659. The next prime is 1665051677. The reversal of 1665051667 is 7661505661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1665051667 - 2³ = 1665051659 is a prime.

It is not a weakly prime, because it can be changed into another prime (1665051677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832525833 + 832525834.

It is an arithmetic number, because the mean of its divisors is an integer number (832525834).

Almost surely, 2^1665051667 is an apocalyptic number.

1665051667 is a deficient number, since it is larger than the sum of its proper divisors (1).

1665051667 is an equidigital number, since it uses as much as digits as its factorization.

1665051667 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 226800, while the sum is 43.

The square root of 1665051667 is about 40805.0446268596. The cubic root of 1665051667 is about 1185.2480189677.

The spelling of 1665051667 in words is "one billion, six hundred sixty-five million, fifty-one thousand, six hundred sixty-seven".