123164810638 has 4 divisors (see below), whose sum is σ = 184747215960. Its totient is φ = 61582405318.

The previous prime is 123164810633. The next prime is 123164810663. The reversal of 123164810638 is 836018461321.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 123164810594 and 123164810603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123164810633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30791202658 + ... + 30791202661.

It is an arithmetic number, because the mean of its divisors is an integer number (46186803990).

Almost surely, 2^123164810638 is an apocalyptic number.

123164810638 is a deficient number, since it is larger than the sum of its proper divisors (61582405322).

123164810638 is an equidigital number, since it uses as much as digits as its factorization.

123164810638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61582405321.

The product of its (nonzero) digits is 165888, while the sum is 43.

The spelling of 123164810638 in words is "one hundred twenty-three billion, one hundred sixty-four million, eight hundred ten thousand, six hundred thirty-eight".