665667752718478 has 8 divisors (see below), whose sum is σ = 999201349915272. Its totient is φ = 332600636080056.

The previous prime is 665667752718421. The next prime is 665667752718481. The reversal of 665667752718478 is 874817257766566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×665667752718478² (a number of 30 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 665667752718395 and 665667752718404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116620136025 + ... + 116620141732.

It is an arithmetic number, because the mean of its divisors is an integer number (124900168739409).

Almost surely, 2^{665667752718478} is an apocalyptic number.

665667752718478 is a deficient number, since it is larger than the sum of its proper divisors (333533597196794).

665667752718478 is a wasteful number, since it uses less digits than its factorization.

665667752718478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233240279186.

The product of its digits is 39829708800, while the sum is 85.

The spelling of 665667752718478 in words is "six hundred sixty-five trillion, six hundred sixty-seven billion, seven hundred fifty-two million, seven hundred eighteen thousand, four hundred seventy-eight".