6670291681 has 8 divisors (see below), whose sum is σ = 6839418600. Its totient is φ = 6501471360.

The previous prime is 6670291679. The next prime is 6670291687. The reversal of 6670291681 is 1861920766.

It can be written as a sum of positive squares in 4 ways, for example, as 41075281 + 6629216400 = 6409^2 + 81420^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6670291681 - 2¹ = 6670291679 is a prime.

It is a super-2 number, since 2×6670291681² = 88985582219235611522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6670291687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32266 + ... + 119923.

It is an arithmetic number, because the mean of its divisors is an integer number (854927325).

Almost surely, 2^6670291681 is an apocalyptic number.

It is an amenable number.

6670291681 is a deficient number, since it is larger than the sum of its proper divisors (169126919).

6670291681 is a wasteful number, since it uses less digits than its factorization.

6670291681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153299.

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 6670291681 is about 81671.8536645275. The cubic root of 6670291681 is about 1882.4131228605.

The spelling of 6670291681 in words is "six billion, six hundred seventy million, two hundred ninety-one thousand, six hundred eighty-one".