2638140181769 has 8 divisors (see below), whose sum is σ = 2777005798080. Its totient is φ = 2499276178800.

The previous prime is 2638140181711. The next prime is 2638140181777. The reversal of 2638140181769 is 9671810418362.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2638140181769 is a prime.

It is a super-2 number, since 2×2638140181769² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2638140181669) 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 7 ways as a sum of consecutive naturals, for example, 4451804 + ... + 5009474.

It is an arithmetic number, because the mean of its divisors is an integer number (347125724760).

Almost surely, 2^{2638140181769} is an apocalyptic number.

It is an amenable number.

2638140181769 is a deficient number, since it is larger than the sum of its proper divisors (138865616311).

2638140181769 is a wasteful number, since it uses less digits than its factorization.

2638140181769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 806671.

The product of its (nonzero) digits is 3483648, while the sum is 56.

The spelling of 2638140181769 in words is "two trillion, six hundred thirty-eight billion, one hundred forty million, one hundred eighty-one thousand, seven hundred sixty-nine".