861205309633 has 4 divisors (see below), whose sum is σ = 862050458160. Its totient is φ = 860360161108.

The previous prime is 861205309631. The next prime is 861205309709. The reversal of 861205309633 is 336903502168.

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 not a de Polignac number, because 861205309633 - 2¹ = 861205309631 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (861205309631) 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, 422572735 + ... + 422574772.

It is an arithmetic number, because the mean of its divisors is an integer number (215512614540).

Almost surely, 2^861205309633 is an apocalyptic number.

It is an amenable number.

861205309633 is a deficient number, since it is larger than the sum of its proper divisors (845148527).

861205309633 is a wasteful number, since it uses less digits than its factorization.

861205309633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 845148526.

The product of its (nonzero) digits is 699840, while the sum is 46.

The spelling of 861205309633 in words is "eight hundred sixty-one billion, two hundred five million, three hundred nine thousand, six hundred thirty-three".