667216074451 has 4 divisors (see below), whose sum is σ = 667239348672. Its totient is φ = 667192800232.

The previous prime is 667216074439. The next prime is 667216074463. The reversal of 667216074451 is 154470612766.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (667216074439) and next prime (667216074463).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667216074451 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 667216074395 and 667216074404.

It is not an unprimeable number, because it can be changed into a prime (667216174451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11594056 + ... + 11651461.

It is an arithmetic number, because the mean of its divisors is an integer number (166809837168).

Almost surely, 2^667216074451 is an apocalyptic number.

667216074451 is a deficient number, since it is larger than the sum of its proper divisors (23274221).

667216074451 is a wasteful number, since it uses less digits than its factorization.

667216074451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23274220.

The product of its (nonzero) digits is 1693440, while the sum is 49.

The spelling of 667216074451 in words is "six hundred sixty-seven billion, two hundred sixteen million, seventy-four thousand, four hundred fifty-one".