861898881101 has 16 divisors (see below), whose sum is σ = 885586944000. Its totient is φ = 838620252288.

The previous prime is 861898881097. The next prime is 861898881113. The reversal of 861898881101 is 101188898168.

It is a cyclic number.

It is not a de Polignac number, because 861898881101 - 2² = 861898881097 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 (861898881121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1206641 + ... + 1783193.

It is an arithmetic number, because the mean of its divisors is an integer number (55349184000).

Almost surely, 2^861898881101 is an apocalyptic number.

It is an amenable number.

861898881101 is a deficient number, since it is larger than the sum of its proper divisors (23688062899).

861898881101 is a wasteful number, since it uses less digits than its factorization.

861898881101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 576908.

The product of its (nonzero) digits is 1769472, while the sum is 59.

The spelling of 861898881101 in words is "eight hundred sixty-one billion, eight hundred ninety-eight million, eight hundred eighty-one thousand, one hundred one".