861930642671 has 24 divisors (see below), whose sum is σ = 1038093981840. Its totient is φ = 712726560000.

The previous prime is 861930642563. The next prime is 861930642691. The reversal of 861930642671 is 176246039168.

It is not a de Polignac number, because 861930642671 - 2¹⁸ = 861930380527 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 (861930642691) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 1454096 + ... + 1959146.

It is an arithmetic number, because the mean of its divisors is an integer number (43253915910).

Almost surely, 2^861930642671 is an apocalyptic number.

861930642671 is a deficient number, since it is larger than the sum of its proper divisors (176163339169).

861930642671 is a wasteful number, since it uses less digits than its factorization.

861930642671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506295 (or 506288 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 53.

The spelling of 861930642671 in words is "eight hundred sixty-one billion, nine hundred thirty million, six hundred forty-two thousand, six hundred seventy-one".