1353640665 has 32 divisors (see below), whose sum is σ = 2334245760. Its totient is φ = 665888256.

The previous prime is 1353640663. The next prime is 1353640681. The reversal of 1353640665 is 5660463531.

It is a happy number.

It is not a de Polignac number, because 1353640665 - 2¹ = 1353640663 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (1353640663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 405694 + ... + 409016.

It is an arithmetic number, because the mean of its divisors is an integer number (72945180).

Almost surely, 2^1353640665 is an apocalyptic number.

1353640665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1353640665 is a deficient number, since it is larger than the sum of its proper divisors (980605095).

1353640665 is a wasteful number, since it uses less digits than its factorization.

1353640665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5433.

The product of its (nonzero) digits is 194400, while the sum is 39.

The square root of 1353640665 is about 36791.8559602529. The cubic root of 1353640665 is about 1106.2020633574.

The spelling of 1353640665 in words is "one billion, three hundred fifty-three million, six hundred forty thousand, six hundred sixty-five".