123400122845 has 4 divisors (see below), whose sum is σ = 148080147420. Its totient is φ = 98720098272.

The previous prime is 123400122841. The next prime is 123400122851. The reversal of 123400122845 is 548221004321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 548221004321 = 1129 ⋅485581049.

It can be written as a sum of positive squares in 2 ways, for example, as 24187092484 + 99213030361 = 155522^2 + 314981^2 .

It is a cyclic number.

It is not a de Polignac number, because 123400122845 - 2² = 123400122841 is a prime.

It is a super-2 number, since 2×123400122845² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123400122841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12340012280 + ... + 12340012289.

It is an arithmetic number, because the mean of its divisors is an integer number (37020036855).

Almost surely, 2^123400122845 is an apocalyptic number.

It is an amenable number.

123400122845 is a deficient number, since it is larger than the sum of its proper divisors (24680024575).

123400122845 is an equidigital number, since it uses as much as digits as its factorization.

123400122845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24680024574.

The product of its (nonzero) digits is 15360, while the sum is 32.

The spelling of 123400122845 in words is "one hundred twenty-three billion, four hundred million, one hundred twenty-two thousand, eight hundred forty-five".