379906666561 has 4 divisors (see below), whose sum is σ = 380456459824. Its totient is φ = 379356873300.

The previous prime is 379906666511. The next prime is 379906666567. The reversal of 379906666561 is 165666609973.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 379906666561 - 2²¹ = 379904569409 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 379906666493 and 379906666502.

It is not an unprimeable number, because it can be changed into a prime (379906666567) 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, 274895595 + ... + 274896976.

It is an arithmetic number, because the mean of its divisors is an integer number (95114114956).

Almost surely, 2^379906666561 is an apocalyptic number.

It is an amenable number.

379906666561 is a deficient number, since it is larger than the sum of its proper divisors (549793263).

379906666561 is an equidigital number, since it uses as much as digits as its factorization.

379906666561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549793262.

The product of its (nonzero) digits is 66134880, while the sum is 64.

The spelling of 379906666561 in words is "three hundred seventy-nine billion, nine hundred six million, six hundred sixty-six thousand, five hundred sixty-one".