861004644785 has 32 divisors (see below), whose sum is σ = 1063057806720. Its totient is φ = 668971325952.

The previous prime is 861004644761. The next prime is 861004644959. The reversal of 861004644785 is 587446400168.

It is a cyclic number.

It is not a de Polignac number, because 861004644785 - 2¹² = 861004640689 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 424766942 + ... + 424768968.

It is an arithmetic number, because the mean of its divisors is an integer number (33220556460).

Almost surely, 2^861004644785 is an apocalyptic number.

It is an amenable number.

861004644785 is a deficient number, since it is larger than the sum of its proper divisors (202053161935).

861004644785 is a wasteful number, since it uses less digits than its factorization.

861004644785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5105.

The product of its (nonzero) digits is 5160960, while the sum is 53.

The spelling of 861004644785 in words is "eight hundred sixty-one billion, four million, six hundred forty-four thousand, seven hundred eighty-five".