665378286377 has 4 divisors (see below), whose sum is σ = 760432327296. Its totient is φ = 570324245460.

The previous prime is 665378286361. The next prime is 665378286403. The reversal of 665378286377 is 773682873566.

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 665378286377 - 2⁴ = 665378286361 is a prime.

It is a super-2 number, since 2×665378286377² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665378286337) 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, 47527020449 + ... + 47527020462.

It is an arithmetic number, because the mean of its divisors is an integer number (190108081824).

Almost surely, 2^665378286377 is an apocalyptic number.

It is an amenable number.

665378286377 is a deficient number, since it is larger than the sum of its proper divisors (95054040919).

665378286377 is an equidigital number, since it uses as much as digits as its factorization.

665378286377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95054040918.

The product of its digits is 426746880, while the sum is 68.

The spelling of 665378286377 in words is "six hundred sixty-five billion, three hundred seventy-eight million, two hundred eighty-six thousand, three hundred seventy-seven".