638813195070 has 16 divisors (see below), whose sum is σ = 1533151668240. Its totient is φ = 170350185344.

The previous prime is 638813195063. The next prime is 638813195087. The reversal of 638813195070 is 70591318836.

It is a Curzon number.

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 7 ways as a sum of consecutive naturals, for example, 10646886555 + ... + 10646886614.

It is an arithmetic number, because the mean of its divisors is an integer number (95821979265).

Almost surely, 2^638813195070 is an apocalyptic number.

638813195070 is an abundant number, since it is smaller than the sum of its proper divisors (894338473170).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

638813195070 is a wasteful number, since it uses less digits than its factorization.

638813195070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21293773179.

The product of its (nonzero) digits is 1088640, while the sum is 51.

The spelling of 638813195070 in words is "six hundred thirty-eight billion, eight hundred thirteen million, one hundred ninety-five thousand, seventy".