1665342657 has 96 divisors (see below), whose sum is σ = 2811768960. Its totient is φ = 940584960.

The previous prime is 1665342631. The next prime is 1665342659. The reversal of 1665342657 is 7562435661.

1665342657 is a `hidden beast` number, since 1 + 66 + 534 + 2 + 6 + 57 = 666.

It is not a de Polignac number, because 1665342657 - 2⁸ = 1665342401 is a prime.

Its product of digits (907200) is a multiple of the sum of its prime divisors (300).

It is not an unprimeable number, because it can be changed into a prime (1665342659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 15278319 + ... + 15278427.

It is an arithmetic number, because the mean of its divisors is an integer number (29289260).

Almost surely, 2^1665342657 is an apocalyptic number.

It is an amenable number.

1665342657 is a deficient number, since it is larger than the sum of its proper divisors (1146426303).

1665342657 is a wasteful number, since it uses less digits than its factorization.

1665342657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303 (or 300 counting only the distinct ones).

The product of its digits is 907200, while the sum is 45.

The square root of 1665342657 is about 40808.6100841477. The cubic root of 1665342657 is about 1185.3170609156.

The spelling of 1665342657 in words is "one billion, six hundred sixty-five million, three hundred forty-two thousand, six hundred fifty-seven".