665378457441 has 32 divisors (see below), whose sum is σ = 895119869952. Its totient is φ = 439634616000.

The previous prime is 665378457413. The next prime is 665378457463. The reversal of 665378457441 is 144754873566.

It is not a de Polignac number, because 665378457441 - 2²² = 665374263137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (665378457241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 140047816 + ... + 140052566.

It is an arithmetic number, because the mean of its divisors is an integer number (27972495936).

Almost surely, 2^665378457441 is an apocalyptic number.

It is an amenable number.

665378457441 is a deficient number, since it is larger than the sum of its proper divisors (229741412511).

665378457441 is a wasteful number, since it uses less digits than its factorization.

665378457441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5893.

The product of its digits is 67737600, while the sum is 60.

The spelling of 665378457441 in words is "six hundred sixty-five billion, three hundred seventy-eight million, four hundred fifty-seven thousand, four hundred forty-one".