2665068421 has 24 divisors (see below), whose sum is σ = 2874187800. Its totient is φ = 2470279680.

The previous prime is 2665068391. The next prime is 2665068433. The reversal of 2665068421 is 1248605662.

It can be written as a sum of positive squares in 4 ways, for example, as 4056196 + 2661012225 = 2014^2 + 51585^2 .

It is not a de Polignac number, because 2665068421 - 2⁷ = 2665068293 is a prime.

It is a super-2 number, since 2×2665068421² = 14205179377222866482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2665068221) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 3501681 + ... + 3502441.

It is an arithmetic number, because the mean of its divisors is an integer number (119757825).

Almost surely, 2^2665068421 is an apocalyptic number.

It is an amenable number.

2665068421 is a deficient number, since it is larger than the sum of its proper divisors (209119379).

2665068421 is a wasteful number, since it uses less digits than its factorization.

2665068421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 997 (or 978 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 40.

The square root of 2665068421 is about 51624.3006829148. The cubic root of 2665068421 is about 1386.4454529225.

The spelling of 2665068421 in words is "two billion, six hundred sixty-five million, sixty-eight thousand, four hundred twenty-one".