667521347652356 has 12 divisors (see below), whose sum is σ = 1169388132121692. Its totient is φ = 333410452760448.

The previous prime is 667521347652311. The next prime is 667521347652371. The reversal of 667521347652356 is 653256743125766.

667521347652356 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 300430462384900 + 367090885267456 = 17332930^2 + 19159616^2 .

It is a super-2 number, since 2×667521347652356² (a number of 30 digits) contains 22 as substring.

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, 87555262145 + ... + 87555269768.

It is an arithmetic number, because the mean of its divisors is an integer number (97449011010141).

Almost surely, 2^{667521347652356} is an apocalyptic number.

It is an amenable number.

667521347652356 is a deficient number, since it is larger than the sum of its proper divisors (501866784469336).

667521347652356 is a wasteful number, since it uses less digits than its factorization.

667521347652356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175110532870 (or 175110532868 counting only the distinct ones).

The product of its digits is 1143072000, while the sum is 68.

The spelling of 667521347652356 in words is "six hundred sixty-seven trillion, five hundred twenty-one billion, three hundred forty-seven million, six hundred fifty-two thousand, three hundred fifty-six".