188138238164 has 6 divisors (see below), whose sum is σ = 329241916794. Its totient is φ = 94069119080.

The previous prime is 188138238161. The next prime is 188138238181. The reversal of 188138238164 is 461832831881.

It can be written as a sum of positive squares in only one way, i.e., 145726954564 + 42411283600 = 381742^2 + 205940^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (188138238161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23517279767 + ... + 23517279774.

It is an arithmetic number, because the mean of its divisors is an integer number (54873652799).

Almost surely, 2^188138238164 is an apocalyptic number.

It is an amenable number.

188138238164 is a deficient number, since it is larger than the sum of its proper divisors (141103678630).

188138238164 is a wasteful number, since it uses less digits than its factorization.

188138238164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47034559545 (or 47034559543 counting only the distinct ones).

The product of its digits is 1769472, while the sum is 53.

The spelling of 188138238164 in words is "one hundred eighty-eight billion, one hundred thirty-eight million, two hundred thirty-eight thousand, one hundred sixty-four".