2660505421 has 6 divisors (see below), whose sum is σ = 3094873710. Its totient is φ = 2280433176.

The previous prime is 2660505413. The next prime is 2660505433. The reversal of 2660505421 is 1245050662.

2660505421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 2647102500 + 13402921 = 51450^2 + 3661^2 .

It is not a de Polignac number, because 2660505421 - 2³ = 2660505413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2660505401) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27147966 + ... + 27148063.

It is an arithmetic number, because the mean of its divisors is an integer number (515812285).

Almost surely, 2^2660505421 is an apocalyptic number.

It is an amenable number.

2660505421 is a deficient number, since it is larger than the sum of its proper divisors (434368289).

2660505421 is an equidigital number, since it uses as much as digits as its factorization.

2660505421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54296043 (or 54296036 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 2660505421 is about 51580.0874466106. The cubic root of 2660505421 is about 1385.6537328367.

The spelling of 2660505421 in words is "two billion, six hundred sixty million, five hundred five thousand, four hundred twenty-one".