4006647370681 has 2 divisors, whose sum is σ = 4006647370682. Its totient is φ = 4006647370680.

The previous prime is 4006647370651. The next prime is 4006647370703. The reversal of 4006647370681 is 1860737466004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3630530106025 + 376117264656 = 1905395^2 + 613284^2 .

It is a cyclic number.

It is not a de Polignac number, because 4006647370681 - 2⁹ = 4006647370169 is a prime.

It is a super-2 number, since 2×4006647370681² (a number of 26 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (4006647370651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2003323685340 + 2003323685341.

It is an arithmetic number, because the mean of its divisors is an integer number (2003323685341).

Almost surely, 2^{4006647370681} is an apocalyptic number.

It is an amenable number.

4006647370681 is a deficient number, since it is larger than the sum of its proper divisors (1).

4006647370681 is an equidigital number, since it uses as much as digits as its factorization.

4006647370681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4064256, while the sum is 52.

The spelling of 4006647370681 in words is "four trillion, six billion, six hundred forty-seven million, three hundred seventy thousand, six hundred eighty-one".