861630426624 has 160 divisors (see below), whose sum is σ = 2546558974080. Its totient is φ = 256674406400.

The previous prime is 861630426593. The next prime is 861630426659. The reversal of 861630426624 is 426624036168.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 564694 + ... + 1429034.

It is an arithmetic number, because the mean of its divisors is an integer number (15915993588).

Almost surely, 2^861630426624 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 861630426624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1273279487040).

861630426624 is an abundant number, since it is smaller than the sum of its proper divisors (1684928547456).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

861630426624 is a wasteful number, since it uses less digits than its factorization.

861630426624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 864432 (or 864416 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 48.

The spelling of 861630426624 in words is "eight hundred sixty-one billion, six hundred thirty million, four hundred twenty-six thousand, six hundred twenty-four".