1662355665 has 24 divisors (see below), whose sum is σ = 2883098088. Its totient is φ = 886072320.

The previous prime is 1662355649. The next prime is 1662355697. The reversal of 1662355665 is 5665532661.

1662355665 is a `hidden beast` number, since 1 + 66 + 23 + 5 + 566 + 5 = 666.

1662355665 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 712729809 + 949625856 = 26697^2 + 30816^2 .

It is not a de Polignac number, because 1662355665 - 2⁴ = 1662355649 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1662355665.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 74625 + ... + 94305.

It is an arithmetic number, because the mean of its divisors is an integer number (120129087).

Almost surely, 2^1662355665 is an apocalyptic number.

1662355665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1662355665 is a deficient number, since it is larger than the sum of its proper divisors (1220742423).

1662355665 is a wasteful number, since it uses less digits than its factorization.

1662355665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21569 (or 21566 counting only the distinct ones).

The product of its digits is 972000, while the sum is 45.

The square root of 1662355665 is about 40771.9960880014. The cubic root of 1662355665 is about 1184.6079673114.

The spelling of 1662355665 in words is "one billion, six hundred sixty-two million, three hundred fifty-five thousand, six hundred sixty-five".