123425278554249 has 27 divisors (see below), whose sum is σ = 207388445095143. Its totient is φ = 70528597286112.

The previous prime is 123425278554239. The next prime is 123425278554287. The reversal of 123425278554249 is 942455872524321.

The square root of 123425278554249 is 11109693.

It is a perfect power (a square), and thus also a powerful number.

123425278554249 is a `hidden beast` number, since 1 + 2 + 3 + 4 + 2 + 5 + 2 + 7 + 85 + 542 + 4 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 7183070015625 + 116242208538624 = 2680125^2 + 10781568^2 .

It is not a de Polignac number, because 123425278554249 - 2²¹ = 123425276457097 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (123425278554239) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 233039037 + ... + 233568069.

Almost surely, 2^{123425278554249} is an apocalyptic number.

123425278554249 is the 11109693-rd square number.

123425278554249 is the 5554847-th centered octagonal number.

It is an amenable number.

123425278554249 is a deficient number, since it is larger than the sum of its proper divisors (83963166540894).

123425278554249 is an frugal number, since it uses more digits than its factorization.

123425278554249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1058086 (or 529043 counting only the distinct ones).

The product of its digits is 193536000, while the sum is 63.

The spelling of 123425278554249 in words is "one hundred twenty-three trillion, four hundred twenty-five billion, two hundred seventy-eight million, five hundred fifty-four thousand, two hundred forty-nine".