667210378256 has 20 divisors (see below), whose sum is σ = 1299418145532. Its totient is φ = 331876663296.

The previous prime is 667210378231. The next prime is 667210378271. The reversal of 667210378256 is 652873012766.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 111863491600 + 555346886656 = 334460^2 + 745216^2 .

It is a junction number, because it is equal to n+sod(n) for n = 667210378198 and 667210378207.

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, 108029681 + ... + 108035856.

Almost surely, 2^667210378256 is an apocalyptic number.

It is an amenable number.

667210378256 is a deficient number, since it is larger than the sum of its proper divisors (632207767276).

667210378256 is a wasteful number, since it uses less digits than its factorization.

667210378256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216065738 (or 216065732 counting only the distinct ones).

The product of its (nonzero) digits is 5080320, while the sum is 53.

The spelling of 667210378256 in words is "six hundred sixty-seven billion, two hundred ten million, three hundred seventy-eight thousand, two hundred fifty-six".