861863320030890 has 32 divisors (see below), whose sum is σ = 2068479915713280. Its totient is φ = 229829335603904.

The previous prime is 861863320030877. The next prime is 861863320030907. The reversal of 861863320030890 is 98030023368168.

It is a self number, because there is not a number n which added to its sum of digits gives 861863320030890.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47235129 + ... + 62887868.

It is an arithmetic number, because the mean of its divisors is an integer number (64639997366040).

Almost surely, 2^{861863320030890} is an apocalyptic number.

861863320030890 is an abundant number, since it is smaller than the sum of its proper divisors (1206616595682390).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

861863320030890 is a wasteful number, since it uses less digits than its factorization.

861863320030890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110383886.

The product of its (nonzero) digits is 8957952, while the sum is 57.

The spelling of 861863320030890 in words is "eight hundred sixty-one trillion, eight hundred sixty-three billion, three hundred twenty million, thirty thousand, eight hundred ninety".