123157738789 has 8 divisors (see below), whose sum is σ = 124448090328. Its totient is φ = 121873059840.

The previous prime is 123157738771. The next prime is 123157738829. The reversal of 123157738789 is 987837751321.

It can be written as a sum of positive squares in 4 ways, for example, as 4591146564 + 118566592225 = 67758^2 + 344335^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 123157738789 - 2³¹ = 121010255141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123157738189) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1374492 + ... + 1461349.

It is an arithmetic number, because the mean of its divisors is an integer number (15556011291).

Almost surely, 2^123157738789 is an apocalyptic number.

It is an amenable number.

123157738789 is a deficient number, since it is larger than the sum of its proper divisors (1290351539).

123157738789 is a wasteful number, since it uses less digits than its factorization.

123157738789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2836295.

The product of its digits is 17781120, while the sum is 61.

The spelling of 123157738789 in words is "one hundred twenty-three billion, one hundred fifty-seven million, seven hundred thirty-eight thousand, seven hundred eighty-nine".