806665316491 has 16 divisors (see below), whose sum is σ = 852568000000. Its totient is φ = 761113021536.

The previous prime is 806665316477. The next prime is 806665316521. The reversal of 806665316491 is 194613566608.

It is a cyclic number.

It is not a de Polignac number, because 806665316491 - 2⁵ = 806665316459 is a prime.

It is a super-3 number, since 3×806665316491³ (a number of 37 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (806665316461) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5026510 + ... + 5184508.

It is an arithmetic number, because the mean of its divisors is an integer number (53285500000).

Almost surely, 2^806665316491 is an apocalyptic number.

806665316491 is a deficient number, since it is larger than the sum of its proper divisors (45902683509).

806665316491 is a wasteful number, since it uses less digits than its factorization.

806665316491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159106.

The product of its (nonzero) digits is 5598720, while the sum is 55.

The spelling of 806665316491 in words is "eight hundred six billion, six hundred sixty-five million, three hundred sixteen thousand, four hundred ninety-one".