861322379925 has 48 divisors (see below), whose sum is σ = 1667184043392. Its totient is φ = 384143769600.

The previous prime is 861322379891. The next prime is 861322379959. The reversal of 861322379925 is 529973223168.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (861322379891) and next prime (861322379959).

It is not a de Polignac number, because 861322379925 - 2⁸ = 861322379669 is a prime.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 19985964 + ... + 20029013.

It is an arithmetic number, because the mean of its divisors is an integer number (34733000904).

Almost surely, 2^861322379925 is an apocalyptic number.

It is an amenable number.

861322379925 is a deficient number, since it is larger than the sum of its proper divisors (805861663467).

861322379925 is a wasteful number, since it uses less digits than its factorization.

861322379925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40015038 (or 40015033 counting only the distinct ones).

The product of its digits is 9797760, while the sum is 57.

The spelling of 861322379925 in words is "eight hundred sixty-one billion, three hundred twenty-two million, three hundred seventy-nine thousand, nine hundred twenty-five".