865802658672 has 560 divisors, whose sum is σ = 2963228277760. Its totient is φ = 239778620928.

The previous prime is 865802658649. The next prime is 865802658767. The reversal of 865802658672 is 276856208568.

It is a super-2 number, since 2×865802658672² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 1398711579 + ... + 1398712197.

Almost surely, 2^865802658672 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 865802658672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1481614138880).

865802658672 is an abundant number, since it is smaller than the sum of its proper divisors (2097425619088).

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

865802658672 is a wasteful number, since it uses less digits than its factorization.

865802658672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1152 (or 1131 counting only the distinct ones).

The product of its (nonzero) digits is 77414400, while the sum is 63.

The spelling of 865802658672 in words is "eight hundred sixty-five billion, eight hundred two million, six hundred fifty-eight thousand, six hundred seventy-two".