667210721265 has 64 divisors (see below), whose sum is σ = 1295319859200. Its totient is φ = 323162251200.

The previous prime is 667210721251. The next prime is 667210721291. The reversal of 667210721265 is 562127012766.

It is not a de Polignac number, because 667210721265 - 2⁶ = 667210721201 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 667210721265.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1210576 + ... + 1673294.

It is an arithmetic number, because the mean of its divisors is an integer number (20239372800).

Almost surely, 2^667210721265 is an apocalyptic number.

It is an amenable number.

667210721265 is a deficient number, since it is larger than the sum of its proper divisors (628109137935).

667210721265 is a wasteful number, since it uses less digits than its factorization.

667210721265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 463715 (or 463709 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 45.

The spelling of 667210721265 in words is "six hundred sixty-seven billion, two hundred ten million, seven hundred twenty-one thousand, two hundred sixty-five".