1645653317 has 16 divisors (see below), whose sum is σ = 2060260224. Its totient is φ = 1276992000.

The previous prime is 1645653313. The next prime is 1645653319. The reversal of 1645653317 is 7133565461.

It is a cyclic number.

It is not a de Polignac number, because 1645653317 - 2² = 1645653313 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645653313) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25784 + ... + 62897.

It is an arithmetic number, because the mean of its divisors is an integer number (128766264).

Almost surely, 2^1645653317 is an apocalyptic number.

It is an amenable number.

1645653317 is a deficient number, since it is larger than the sum of its proper divisors (414606907).

1645653317 is a wasteful number, since it uses less digits than its factorization.

1645653317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88940.

The product of its digits is 226800, while the sum is 41.

The square root of 1645653317 is about 40566.6527704715. The cubic root of 1645653317 is about 1180.6271962571.

The spelling of 1645653317 in words is "one billion, six hundred forty-five million, six hundred fifty-three thousand, three hundred seventeen".