665120437063156 has 6 divisors (see below), whose sum is σ = 1163960764860530. Its totient is φ = 332560218531576.

The previous prime is 665120437063139. The next prime is 665120437063189. The reversal of 665120437063156 is 651360734021566.

It can be written as a sum of positive squares in only one way, i.e., 644496722563600 + 20623714499556 = 25386940^2 + 4541334^2 .

It is a super-3 number, since 3×665120437063156³ (a number of 45 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 665120437063097 and 665120437063106.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83140054632891 + ... + 83140054632898.

Almost surely, 2^{665120437063156} is an apocalyptic number.

It is an amenable number.

665120437063156 is a deficient number, since it is larger than the sum of its proper divisors (498840327797374).

665120437063156 is a wasteful number, since it uses less digits than its factorization.

665120437063156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166280109265793 (or 166280109265791 counting only the distinct ones).

The product of its (nonzero) digits is 16329600, while the sum is 55.

The spelling of 665120437063156 in words is "six hundred sixty-five trillion, one hundred twenty billion, four hundred thirty-seven million, sixty-three thousand, one hundred fifty-six".