164787384638 has 4 divisors (see below), whose sum is σ = 247181076960. Its totient is φ = 82393692318.

The previous prime is 164787384577. The next prime is 164787384647. The reversal of 164787384638 is 836483787461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 836483787461 = 7 ⋅119497683923.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41196846158 + ... + 41196846161.

It is an arithmetic number, because the mean of its divisors is an integer number (61795269240).

Almost surely, 2^164787384638 is an apocalyptic number.

164787384638 is a deficient number, since it is larger than the sum of its proper divisors (82393692322).

164787384638 is an equidigital number, since it uses as much as digits as its factorization.

164787384638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82393692321.

The product of its digits is 130056192, while the sum is 65.

The spelling of 164787384638 in words is "one hundred sixty-four billion, seven hundred eighty-seven million, three hundred eighty-four thousand, six hundred thirty-eight".