2665168286640 has 80 divisors (see below), whose sum is σ = 8264444979168. Its totient is φ = 710503088128.

The previous prime is 2665168286617. The next prime is 2665168286681. The reversal of 2665168286640 is 466828615662.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×2665168286640² (a number of 26 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 807729 + ... + 2445968.

Almost surely, 2^{2665168286640} is an apocalyptic number.

2665168286640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2665168286640 is an abundant number, since it is smaller than the sum of its proper divisors (5599276692528).

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

2665168286640 is a wasteful number, since it uses less digits than its factorization.

2665168286640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3257126 (or 3257120 counting only the distinct ones).

The product of its (nonzero) digits is 39813120, while the sum is 60.

The spelling of 2665168286640 in words is "two trillion, six hundred sixty-five billion, one hundred sixty-eight million, two hundred eighty-six thousand, six hundred forty".