667972751616 has 81 divisors (see below), whose sum is σ = 1926043233751. Its totient is φ = 222644507136.

The previous prime is 667972751603. The next prime is 667972751711. The reversal of 667972751616 is 616157279766.

The square root of 667972751616 is 817296.

It is a perfect power (a square), and thus also a powerful number.

667972751616 is a `hidden beast` number, since 6 + 6 + 7 + 9 + 7 + 2 + 7 + 5 + 1 + 616 = 666.

It is a super-2 number, since 2×667972751616² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 39221695 + ... + 39238721.

Almost surely, 2^667972751616 is an apocalyptic number.

667972751616 is the 817296-th square number.

It is an amenable number.

667972751616 is an abundant number, since it is smaller than the sum of its proper divisors (1258070482135).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

667972751616 is an frugal number, since it uses more digits than its factorization.

667972751616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34076 (or 17032 counting only the distinct ones).

The product of its digits is 40007520, while the sum is 63.

The spelling of 667972751616 in words is "six hundred sixty-seven billion, nine hundred seventy-two million, seven hundred fifty-one thousand, six hundred sixteen".