861044862903 has 4 divisors (see below), whose sum is σ = 1148059817208. Its totient is φ = 574029908600.

The previous prime is 861044862883. The next prime is 861044862947. The reversal of 861044862903 is 309268440168.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 861044862903 - 2⁸ = 861044862647 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861044862983) 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, 143507477148 + ... + 143507477153.

It is an arithmetic number, because the mean of its divisors is an integer number (287014954302).

Almost surely, 2^861044862903 is an apocalyptic number.

861044862903 is a deficient number, since it is larger than the sum of its proper divisors (287014954305).

861044862903 is a wasteful number, since it uses less digits than its factorization.

861044862903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287014954304.

The product of its (nonzero) digits is 1990656, while the sum is 51.

The spelling of 861044862903 in words is "eight hundred sixty-one billion, forty-four million, eight hundred sixty-two thousand, nine hundred three".