1653668657 has 8 divisors (see below), whose sum is σ = 1670884032. Its totient is φ = 1636470000.

The previous prime is 1653668647. The next prime is 1653668663. The reversal of 1653668657 is 7568663561.

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

It is a cyclic number.

It is not a de Polignac number, because 1653668657 - 2⁶ = 1653668593 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1653668599 and 1653668608.

It is not an unprimeable number, because it can be changed into a prime (1653668617) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 331532 + ... + 336482.

It is an arithmetic number, because the mean of its divisors is an integer number (208860504).

Almost surely, 2^1653668657 is an apocalyptic number.

It is an amenable number.

1653668657 is a deficient number, since it is larger than the sum of its proper divisors (17215375).

1653668657 is a wasteful number, since it uses less digits than its factorization.

1653668657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8359.

The product of its digits is 5443200, while the sum is 53.

The square root of 1653668657 is about 40665.3249956274. The cubic root of 1653668657 is about 1182.5408852841.

The spelling of 1653668657 in words is "one billion, six hundred fifty-three million, six hundred sixty-eight thousand, six hundred fifty-seven".