381770665 has 4 divisors (see below), whose sum is σ = 458124804. Its totient is φ = 305416528.

The previous prime is 381770657. The next prime is 381770671. The reversal of 381770665 is 566077183.

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 187251856 + 194518809 = 13684^2 + 13947^2 .

It is a cyclic number.

It is not a de Polignac number, because 381770665 - 2³ = 381770657 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38177062 + ... + 38177071.

It is an arithmetic number, because the mean of its divisors is an integer number (114531201).

Almost surely, 2^381770665 is an apocalyptic number.

It is an amenable number.

381770665 is a deficient number, since it is larger than the sum of its proper divisors (76354139).

381770665 is an equidigital number, since it uses as much as digits as its factorization.

381770665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76354138.

The product of its (nonzero) digits is 211680, while the sum is 43.

The square root of 381770665 is about 19538.9525051882. The cubic root of 381770665 is about 725.4389193191.

The spelling of 381770665 in words is "three hundred eighty-one million, seven hundred seventy thousand, six hundred sixty-five".