2664400091 has 4 divisors (see below), whose sum is σ = 2664531192. Its totient is φ = 2664268992.

The previous prime is 2664400087. The next prime is 2664400111. The reversal of 2664400091 is 1900044662.

It is a happy number.

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 2664400091 - 2² = 2664400087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2664450091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27830 + ... + 78123.

It is an arithmetic number, because the mean of its divisors is an integer number (666132798).

Almost surely, 2^2664400091 is an apocalyptic number.

2664400091 is a deficient number, since it is larger than the sum of its proper divisors (131101).

2664400091 is a wasteful number, since it uses less digits than its factorization.

2664400091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131100.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 2664400091 is about 51617.8272595815. The cubic root of 2664400091 is about 1386.3295483864.

The spelling of 2664400091 in words is "two billion, six hundred sixty-four million, four hundred thousand, ninety-one".