861861022629 has 4 divisors (see below), whose sum is σ = 1149148030176. Its totient is φ = 574574015084.

The previous prime is 861861022577. The next prime is 861861022643. The reversal of 861861022629 is 926220168168.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 861861022629 - 2¹² = 861861018533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861861022129) 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, 143643503769 + ... + 143643503774.

It is an arithmetic number, because the mean of its divisors is an integer number (287287007544).

Almost surely, 2^861861022629 is an apocalyptic number.

It is an amenable number.

861861022629 is a deficient number, since it is larger than the sum of its proper divisors (287287007547).

861861022629 is a wasteful number, since it uses less digits than its factorization.

861861022629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287287007546.

The product of its (nonzero) digits is 995328, while the sum is 51.

The spelling of 861861022629 in words is "eight hundred sixty-one billion, eight hundred sixty-one million, twenty-two thousand, six hundred twenty-nine".