2664191242638 has 12 divisors (see below), whose sum is σ = 5772414359088. Its totient is φ = 888063747540.

The previous prime is 2664191242571. The next prime is 2664191242639. The reversal of 2664191242638 is 8362421914662.

2664191242638 is a `hidden beast` number, since 2 + 66 + 41 + 91 + 2 + 426 + 38 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2664191242639) 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 5 ways as a sum of consecutive naturals, for example, 74005312278 + ... + 74005312313.

It is an arithmetic number, because the mean of its divisors is an integer number (481034529924).

Almost surely, 2^{2664191242638} is an apocalyptic number.

2664191242638 is an abundant number, since it is smaller than the sum of its proper divisors (3108223116450).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2664191242638 is a wasteful number, since it uses less digits than its factorization.

2664191242638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148010624599 (or 148010624596 counting only the distinct ones).

The product of its digits is 5971968, while the sum is 54.

The spelling of 2664191242638 in words is "two trillion, six hundred sixty-four billion, one hundred ninety-one million, two hundred forty-two thousand, six hundred thirty-eight".