1672217645 has 32 divisors (see below), whose sum is σ = 2519009280. Its totient is φ = 1039072320.

The previous prime is 1672217621. The next prime is 1672217663. The reversal of 1672217645 is 5467122761.

It is not a de Polignac number, because 1672217645 - 2²⁰ = 1671169069 is a prime.

It is a super-3 number, since 3×1672217645³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 39371 + ... + 69960.

It is an arithmetic number, because the mean of its divisors is an integer number (78719040).

Almost surely, 2^1672217645 is an apocalyptic number.

It is an amenable number.

1672217645 is a deficient number, since it is larger than the sum of its proper divisors (846791635).

1672217645 is a wasteful number, since it uses less digits than its factorization.

1672217645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109385.

The product of its digits is 141120, while the sum is 41.

The square root of 1672217645 is about 40892.7578551508. The cubic root of 1672217645 is about 1186.9459253746.

The spelling of 1672217645 in words is "one billion, six hundred seventy-two million, two hundred seventeen thousand, six hundred forty-five".