805660001 has 16 divisors (see below), whose sum is σ = 833571648. Its totient is φ = 778344000.

The previous prime is 805659989. The next prime is 805660003. The reversal of 805660001 is 100066508.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-805660001 is a prime.

It is a super-2 number, since 2×805660001² = 1298176074422640002, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (805660003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1148951 + ... + 1149651.

It is an arithmetic number, because the mean of its divisors is an integer number (52098228).

Almost surely, 2^805660001 is an apocalyptic number.

It is an amenable number.

805660001 is a deficient number, since it is larger than the sum of its proper divisors (27911647).

805660001 is a wasteful number, since it uses less digits than its factorization.

805660001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1072.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 805660001 is about 28384.1505245445. The cubic root of 805660001 is about 930.5019069807.

The spelling of 805660001 in words is "eight hundred five million, six hundred sixty thousand, one".