1670505385 has 8 divisors (see below), whose sum is σ = 2025273096. Its totient is φ = 1322626560.

The previous prime is 1670505377. The next prime is 1670505407. The reversal of 1670505385 is 5835050761.

It can be written as a sum of positive squares in 4 ways, for example, as 7823209 + 1662682176 = 2797^2 + 40776^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1670505385 - 2³ = 1670505377 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1721686 + ... + 1722655.

It is an arithmetic number, because the mean of its divisors is an integer number (253159137).

Almost surely, 2^1670505385 is an apocalyptic number.

It is an amenable number.

1670505385 is a deficient number, since it is larger than the sum of its proper divisors (354767711).

1670505385 is an equidigital number, since it uses as much as digits as its factorization.

1670505385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3444443.

The product of its (nonzero) digits is 126000, while the sum is 40.

The square root of 1670505385 is about 40871.8165121150. The cubic root of 1670505385 is about 1186.5406643118.

The spelling of 1670505385 in words is "one billion, six hundred seventy million, five hundred five thousand, three hundred eighty-five".