805069661 has 4 divisors (see below), whose sum is σ = 878257824. Its totient is φ = 731881500.

The previous prime is 805069649. The next prime is 805069669. The reversal of 805069661 is 166960508.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-805069661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (805069669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36594065 + ... + 36594086.

It is an arithmetic number, because the mean of its divisors is an integer number (219564456).

Almost surely, 2^805069661 is an apocalyptic number.

It is an amenable number.

805069661 is a deficient number, since it is larger than the sum of its proper divisors (73188163).

805069661 is a wasteful number, since it uses less digits than its factorization.

805069661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73188162.

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 805069661 is about 28373.7495054848. The cubic root of 805069661 is about 930.2745791925.

The spelling of 805069661 in words is "eight hundred five million, sixty-nine thousand, six hundred sixty-one".