638611725467 has 4 divisors (see below), whose sum is σ = 650661003360. Its totient is φ = 626562447576.

The previous prime is 638611725457. The next prime is 638611725469. The reversal of 638611725467 is 764527116836.

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 638611725467 - 2¹⁴ = 638611709083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638611725469) 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, 6024638867 + ... + 6024638972.

It is an arithmetic number, because the mean of its divisors is an integer number (162665250840).

Almost surely, 2^638611725467 is an apocalyptic number.

638611725467 is a deficient number, since it is larger than the sum of its proper divisors (12049277893).

638611725467 is a wasteful number, since it uses less digits than its factorization.

638611725467 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12049277892.

The product of its digits is 10160640, while the sum is 56.

The spelling of 638611725467 in words is "six hundred thirty-eight billion, six hundred eleven million, seven hundred twenty-five thousand, four hundred sixty-seven".