2661868799 has 4 divisors (see below), whose sum is σ = 2668016736. Its totient is φ = 2655720864.

The previous prime is 2661868771. The next prime is 2661868801. The reversal of 2661868799 is 9978681662.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2661868799 - 2¹² = 2661864703 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 (2661868999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3073319 + ... + 3074184.

It is an arithmetic number, because the mean of its divisors is an integer number (667004184).

Almost surely, 2^2661868799 is an apocalyptic number.

2661868799 is a deficient number, since it is larger than the sum of its proper divisors (6147937).

2661868799 is an equidigital number, since it uses as much as digits as its factorization.

2661868799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6147936.

The product of its digits is 15676416, while the sum is 62.

The square root of 2661868799 is about 51593.3018811551. The cubic root of 2661868799 is about 1385.8903855156.

The spelling of 2661868799 in words is "two billion, six hundred sixty-one million, eight hundred sixty-eight thousand, seven hundred ninety-nine".