2865531271680 has 3840 divisors, whose sum is σ = 14240379985920. Its totient is φ = 536043847680.

The previous prime is 2865531271643. The next prime is 2865531271769. The reversal of 2865531271680 is 861721355682.

2865531271680 is a `hidden beast` number, since 2 + 8 + 6 + 5 + 531 + 27 + 1 + 6 + 80 = 666.

It is a tau number, because it is divible by the number of its divisors (3840).

It is a super-2 number, since 2×2865531271680² (a number of 26 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 383 ways as a sum of consecutive naturals, for example, 124588316149 + ... + 124588316171.

It is an arithmetic number, because the mean of its divisors is an integer number (3708432288).

Almost surely, 2^{2865531271680} is an apocalyptic number.

2865531271680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2865531271680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7120189992960).

2865531271680 is an abundant number, since it is smaller than the sum of its proper divisors (11374848714240).

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

2865531271680 is an equidigital number, since it uses as much as digits as its factorization.

2865531271680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119 (or 68 counting only the distinct ones).

The product of its (nonzero) digits is 4838400, while the sum is 54.

The spelling of 2865531271680 in words is "two trillion, eight hundred sixty-five billion, five hundred thirty-one million, two hundred seventy-one thousand, six hundred eighty".