2145668605 has 16 divisors (see below), whose sum is σ = 2593833984. Its totient is φ = 1703877120.

The previous prime is 2145668599. The next prime is 2145668641. The reversal of 2145668605 is 5068665412.

It is not a de Polignac number, because 2145668605 - 2⁷ = 2145668477 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 826189 + ... + 828781.

It is an arithmetic number, because the mean of its divisors is an integer number (162114624).

Almost surely, 2^2145668605 is an apocalyptic number.

It is an amenable number.

2145668605 is a deficient number, since it is larger than the sum of its proper divisors (448165379).

2145668605 is a wasteful number, since it uses less digits than its factorization.

2145668605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3756.

The product of its (nonzero) digits is 345600, while the sum is 43.

The square root of 2145668605 is about 46321.3622964610. The cubic root of 2145668605 is about 1289.7955738399.

The spelling of 2145668605 in words is "two billion, one hundred forty-five million, six hundred sixty-eight thousand, six hundred five".