1670521885 has 4 divisors (see below), whose sum is σ = 2004626268. Its totient is φ = 1336417504.

The previous prime is 1670521859. The next prime is 1670521889. The reversal of 1670521885 is 5881250761.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 980566596 + 689955289 = 31314^2 + 26267^2 .

It is a cyclic number.

It is not a de Polignac number, because 1670521885 - 2¹⁹ = 1669997597 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 (1670521889) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 167052184 + ... + 167052193.

It is an arithmetic number, because the mean of its divisors is an integer number (501156567).

Almost surely, 2^1670521885 is an apocalyptic number.

It is an amenable number.

1670521885 is a deficient number, since it is larger than the sum of its proper divisors (334104383).

1670521885 is an equidigital number, since it uses as much as digits as its factorization.

1670521885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334104382.

The product of its (nonzero) digits is 134400, while the sum is 43.

The square root of 1670521885 is about 40872.0183621998. The cubic root of 1670521885 is about 1186.5445708853.

The spelling of 1670521885 in words is "one billion, six hundred seventy million, five hundred twenty-one thousand, eight hundred eighty-five".