381660689959 has 4 divisors (see below), whose sum is σ = 381703242760. Its totient is φ = 381618137160.

The previous prime is 381660689953. The next prime is 381660689999. The reversal of 381660689959 is 959986066183.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 959986066183 = 17 ⋅56469768599.

It is a cyclic number.

It is not a de Polignac number, because 381660689959 - 2⁷ = 381660689831 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 (381660689953) 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, 21262944 + ... + 21280885.

It is an arithmetic number, because the mean of its divisors is an integer number (95425810690).

Almost surely, 2^381660689959 is an apocalyptic number.

381660689959 is a deficient number, since it is larger than the sum of its proper divisors (42552801).

381660689959 is an equidigital number, since it uses as much as digits as its factorization.

381660689959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42552800.

The product of its (nonzero) digits is 151165440, while the sum is 70.

The spelling of 381660689959 in words is "three hundred eighty-one billion, six hundred sixty million, six hundred eighty-nine thousand, nine hundred fifty-nine".