1672818661 has 8 divisors (see below), whose sum is σ = 1693437048. Its totient is φ = 1652280000.

The previous prime is 1672818659. The next prime is 1672818673. The reversal of 1672818661 is 1668182761.

It can be written as a sum of positive squares in 4 ways, for example, as 2461761 + 1670356900 = 1569^2 + 40870^2 .

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 1672818661 - 2¹ = 1672818659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1672818611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22851 + ... + 62191.

It is an arithmetic number, because the mean of its divisors is an integer number (211679631).

Almost surely, 2^1672818661 is an apocalyptic number.

It is an amenable number.

1672818661 is a deficient number, since it is larger than the sum of its proper divisors (20618387).

1672818661 is a wasteful number, since it uses less digits than its factorization.

1672818661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39863.

The product of its digits is 193536, while the sum is 46.

The square root of 1672818661 is about 40900.1058800586. The cubic root of 1672818661 is about 1187.0881094271.

The spelling of 1672818661 in words is "one billion, six hundred seventy-two million, eight hundred eighteen thousand, six hundred sixty-one".