6638890523 has 4 divisors (see below), whose sum is σ = 6642972600. Its totient is φ = 6634808448.

The previous prime is 6638890487. The next prime is 6638890547. The reversal of 6638890523 is 3250988366.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3250988366 = 2 ⋅1625494183.

It is a cyclic number.

It is not a de Polignac number, because 6638890523 - 2¹⁴ = 6638874139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6638890553) 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, 2038598 + ... + 2041851.

It is an arithmetic number, because the mean of its divisors is an integer number (1660743150).

Almost surely, 2^6638890523 is an apocalyptic number.

6638890523 is a deficient number, since it is larger than the sum of its proper divisors (4082077).

6638890523 is a wasteful number, since it uses less digits than its factorization.

6638890523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4082076.

The product of its (nonzero) digits is 1866240, while the sum is 50.

The square root of 6638890523 is about 81479.3871049605. The cubic root of 6638890523 is about 1879.4545840296.

The spelling of 6638890523 in words is "six billion, six hundred thirty-eight million, eight hundred ninety thousand, five hundred twenty-three".