1672217641 has 4 divisors (see below), whose sum is σ = 1677664912. Its totient is φ = 1666770372.

The previous prime is 1672217621. The next prime is 1672217663. The reversal of 1672217641 is 1467122761.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1672217641 - 2⁵ = 1672217609 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1672217641.

It is not an unprimeable number, because it can be changed into a prime (1672217621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2723175 + ... + 2723788.

It is an arithmetic number, because the mean of its divisors is an integer number (419416228).

Almost surely, 2^1672217641 is an apocalyptic number.

It is an amenable number.

1672217641 is a deficient number, since it is larger than the sum of its proper divisors (5447271).

1672217641 is an equidigital number, since it uses as much as digits as its factorization.

1672217641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5447270.

The product of its digits is 28224, while the sum is 37.

The square root of 1672217641 is about 40892.7578062424. The cubic root of 1672217641 is about 1186.9459244282.

The spelling of 1672217641 in words is "one billion, six hundred seventy-two million, two hundred seventeen thousand, six hundred forty-one".