123351937738 has 4 divisors (see below), whose sum is σ = 185027906610. Its totient is φ = 61675968868.

The previous prime is 123351937673. The next prime is 123351937741. The reversal of 123351937738 is 837739153321.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 837739153321 = 7 ⋅119677021903.

It can be written as a sum of positive squares in only one way, i.e., 70020039769 + 53331897969 = 264613^2 + 230937^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30837984433 + ... + 30837984436.

Almost surely, 2^123351937738 is an apocalyptic number.

123351937738 is a deficient number, since it is larger than the sum of its proper divisors (61675968872).

123351937738 is an equidigital number, since it uses as much as digits as its factorization.

123351937738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61675968871.

The product of its digits is 2857680, while the sum is 52.

The spelling of 123351937738 in words is "one hundred twenty-three billion, three hundred fifty-one million, nine hundred thirty-seven thousand, seven hundred thirty-eight".