1653917665 has 8 divisors (see below), whose sum is σ = 2012655168. Its totient is φ = 1304498160.

The previous prime is 1653917653. The next prime is 1653917773. The reversal of 1653917665 is 5667193561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1653917665 - 2¹⁷ = 1653786593 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2329107 + ... + 2329816.

It is an arithmetic number, because the mean of its divisors is an integer number (251581896).

Almost surely, 2^1653917665 is an apocalyptic number.

It is an amenable number.

1653917665 is a deficient number, since it is larger than the sum of its proper divisors (358737503).

1653917665 is an equidigital number, since it uses as much as digits as its factorization.

1653917665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4658999.

The product of its digits is 1020600, while the sum is 49.

The square root of 1653917665 is about 40668.3865551610. The cubic root of 1653917665 is about 1182.6002376340.

It can be divided in two parts, 165391 and 7665, that added together give a square (173056 = 416²).

The spelling of 1653917665 in words is "one billion, six hundred fifty-three million, nine hundred seventeen thousand, six hundred sixty-five".