638584543545 has 16 divisors (see below), whose sum is σ = 1100330290752. Its totient is φ = 314380082880.

The previous prime is 638584543469. The next prime is 638584543549. The reversal of 638584543545 is 545345485836.

It is not a de Polignac number, because 638584543545 - 2³⁰ = 637510801721 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (638584543549) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1637396071 + ... + 1637396460.

It is an arithmetic number, because the mean of its divisors is an integer number (68770643172).

Almost surely, 2^638584543545 is an apocalyptic number.

638584543545 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

638584543545 is a deficient number, since it is larger than the sum of its proper divisors (461745747207).

638584543545 is a wasteful number, since it uses less digits than its factorization.

638584543545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3274792552.

The product of its digits is 138240000, while the sum is 60.

The spelling of 638584543545 in words is "six hundred thirty-eight billion, five hundred eighty-four million, five hundred forty-three thousand, five hundred forty-five".