1662668865 has 144 divisors (see below), whose sum is σ = 3464750016. Its totient is φ = 732568320.

The previous prime is 1662668837. The next prime is 1662668869. The reversal of 1662668865 is 5688662661.

It is a happy number.

1662668865 is a `hidden beast` number, since 1 + 6 + 626 + 6 + 8 + 8 + 6 + 5 = 666.

It is not a de Polignac number, because 1662668865 - 2⁷ = 1662668737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1662668869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 5875014 + ... + 5875296.

It is an arithmetic number, because the mean of its divisors is an integer number (24060764).

Almost surely, 2^1662668865 is an apocalyptic number.

1662668865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1662668865 is an abundant number, since it is smaller than the sum of its proper divisors (1802081151).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1662668865 is a wasteful number, since it uses less digits than its factorization.

1662668865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412 (or 398 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 54.

The square root of 1662668865 is about 40775.8367786610. The cubic root of 1662668865 is about 1184.6823589162.

It can be divided in two parts, 16626 and 68865, that added together give a triangular number (85491 = T₄₁₃).

The spelling of 1662668865 in words is "one billion, six hundred sixty-two million, six hundred sixty-eight thousand, eight hundred sixty-five".