2660661979 has 8 divisors (see below), whose sum is σ = 2801315840. Its totient is φ = 2520070056.

The previous prime is 2660661973. The next prime is 2660661989. The reversal of 2660661979 is 9791660662.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2660661979 - 2⁵ = 2660661947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2660661973) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91834 + ... + 117280.

It is an arithmetic number, because the mean of its divisors is an integer number (350164480).

Almost surely, 2^2660661979 is an apocalyptic number.

2660661979 is a deficient number, since it is larger than the sum of its proper divisors (140653861).

2660661979 is a wasteful number, since it uses less digits than its factorization.

2660661979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30969.

The product of its (nonzero) digits is 1469664, while the sum is 52.

The square root of 2660661979 is about 51581.6050448219. The cubic root of 2660661979 is about 1385.6809119986.

The spelling of 2660661979 in words is "two billion, six hundred sixty million, six hundred sixty-one thousand, nine hundred seventy-nine".