861723424871 has 2 divisors, whose sum is σ = 861723424872. Its totient is φ = 861723424870.

The previous prime is 861723424831. The next prime is 861723424879. The reversal of 861723424871 is 178424327168.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 861723424871 - 2²⁶ = 861656316007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (861723424879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430861712435 + 430861712436.

It is an arithmetic number, because the mean of its divisors is an integer number (430861712436).

Almost surely, 2^861723424871 is an apocalyptic number.

861723424871 is a deficient number, since it is larger than the sum of its proper divisors (1).

861723424871 is an equidigital number, since it uses as much as digits as its factorization.

861723424871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3612672, while the sum is 53.

The spelling of 861723424871 in words is "eight hundred sixty-one billion, seven hundred twenty-three million, four hundred twenty-four thousand, eight hundred seventy-one".