638261130485 has 16 divisors (see below), whose sum is σ = 836125018560. Its totient is φ = 463865927040.

The previous prime is 638261130431. The next prime is 638261130499. The reversal of 638261130485 is 584031162836.

It is not a de Polignac number, because 638261130485 - 2⁶ = 638261130421 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3970295 + ... + 4127924.

It is an arithmetic number, because the mean of its divisors is an integer number (52257813660).

Almost surely, 2^638261130485 is an apocalyptic number.

It is an amenable number.

638261130485 is a deficient number, since it is larger than the sum of its proper divisors (197863888075).

638261130485 is a wasteful number, since it uses less digits than its factorization.

638261130485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8099668.

The product of its (nonzero) digits is 829440, while the sum is 47.

The spelling of 638261130485 in words is "six hundred thirty-eight billion, two hundred sixty-one million, one hundred thirty thousand, four hundred eighty-five".