381277665443 has 4 divisors (see below), whose sum is σ = 381433865208. Its totient is φ = 381121465680.

The previous prime is 381277665383. The next prime is 381277665449. The reversal of 381277665443 is 344566772183.

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

It is a cyclic number.

It is not a de Polignac number, because 381277665443 - 2²⁰ = 381276616867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381277665449) 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, 78096221 + ... + 78101102.

It is an arithmetic number, because the mean of its divisors is an integer number (95358466302).

Almost surely, 2^381277665443 is an apocalyptic number.

381277665443 is a deficient number, since it is larger than the sum of its proper divisors (156199765).

381277665443 is a wasteful number, since it uses less digits than its factorization.

381277665443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156199764.

The product of its digits is 20321280, while the sum is 56.

The spelling of 381277665443 in words is "three hundred eighty-one billion, two hundred seventy-seven million, six hundred sixty-five thousand, four hundred forty-three".