1670472805 has 4 divisors (see below), whose sum is σ = 2004567372. Its totient is φ = 1336378240.

The previous prime is 1670472787. The next prime is 1670472809. The reversal of 1670472805 is 5082740761.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5082740761 = 7 ⋅726105823.

It can be written as a sum of positive squares in 2 ways, for example, as 1192044676 + 478428129 = 34526^2 + 21873^2 .

It is not a de Polignac number, because 1670472805 - 2⁷ = 1670472677 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1670472809) 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, 167047276 + ... + 167047285.

It is an arithmetic number, because the mean of its divisors is an integer number (501141843).

Almost surely, 2^1670472805 is an apocalyptic number.

It is an amenable number.

1670472805 is a deficient number, since it is larger than the sum of its proper divisors (334094567).

1670472805 is an equidigital number, since it uses as much as digits as its factorization.

1670472805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334094566.

The product of its (nonzero) digits is 94080, while the sum is 40.

The square root of 1670472805 is about 40871.4179470201. The cubic root of 1670472805 is about 1186.5329505292.

The spelling of 1670472805 in words is "one billion, six hundred seventy million, four hundred seventy-two thousand, eight hundred five".