2660643397 has 16 divisors (see below), whose sum is σ = 2881008000. Its totient is φ = 2448532800.

The previous prime is 2660643379. The next prime is 2660643439. The reversal of 2660643397 is 7933460662.

It is a cyclic number.

It is not a de Polignac number, because 2660643397 - 2²⁷ = 2526425669 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2660643317) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 490104 + ... + 495502.

It is an arithmetic number, because the mean of its divisors is an integer number (180063000).

Almost surely, 2^2660643397 is an apocalyptic number.

It is an amenable number.

2660643397 is a deficient number, since it is larger than the sum of its proper divisors (220364603).

2660643397 is a wasteful number, since it uses less digits than its factorization.

2660643397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6156.

The product of its (nonzero) digits is 979776, while the sum is 46.

The square root of 2660643397 is about 51581.4249221558. The cubic root of 2660643397 is about 1385.6776861369.

The spelling of 2660643397 in words is "two billion, six hundred sixty million, six hundred forty-three thousand, three hundred ninety-seven".