861646030101 has 6 divisors (see below), whose sum is σ = 1244599821270. Its totient is φ = 574430686728.

The previous prime is 861646030057. The next prime is 861646030127. The reversal of 861646030101 is 101030646168.

861646030101 is a `hidden beast` number, since 8 + 6 + 1 + 646 + 0 + 3 + 0 + 1 + 0 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 621967245201 + 239678784900 = 788649^2 + 489570^2 .

It is not a de Polignac number, because 861646030101 - 2⁷ = 861646029973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861646430101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 47869223886 + ... + 47869223903.

It is an arithmetic number, because the mean of its divisors is an integer number (207433303545).

Almost surely, 2^861646030101 is an apocalyptic number.

It is an amenable number.

861646030101 is a deficient number, since it is larger than the sum of its proper divisors (382953791169).

861646030101 is a wasteful number, since it uses less digits than its factorization.

861646030101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95738447795 (or 95738447792 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

Adding to 861646030101 its reverse (101030646168), we get a palindrome (962676676269).

It can be divided in two parts, 8616460 and 30101, that added together give a triangular number (8646561 = T₄₁₅₈).

The spelling of 861646030101 in words is "eight hundred sixty-one billion, six hundred forty-six million, thirty thousand, one hundred one".