638068117122 has 90 divisors (see below), whose sum is σ = 1446873096537. Its totient is φ = 210171355776.

The previous prime is 638068117121. The next prime is 638068117157. The reversal of 638068117122 is 221711860836.

638068117122 is a `hidden beast` number, since 6 + 380 + 6 + 81 + 171 + 22 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 636406658001 + 1661459121 = 797751^2 + 40761^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=564831.

It is a super-2 number, since 2×638068117122² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (638068117121) 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 44 ways as a sum of consecutive naturals, for example, 986194603 + ... + 986195249.

Almost surely, 2^638068117122 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 638068117122

638068117122 is an abundant number, since it is smaller than the sum of its proper divisors (808804979415).

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

638068117122 is an frugal number, since it uses more digits than its factorization.

638068117122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1502 (or 749 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

Adding to 638068117122 its reverse (221711860836), we get a palindrome (859779977958).

The spelling of 638068117122 in words is "six hundred thirty-eight billion, sixty-eight million, one hundred seventeen thousand, one hundred twenty-two".