123455666679 has 4 divisors (see below), whose sum is σ = 164607555576. Its totient is φ = 82303777784.

The previous prime is 123455666671. The next prime is 123455666687. The reversal of 123455666679 is 976666554321.

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

It is an interprime number because it is at equal distance from previous prime (123455666671) and next prime (123455666687).

It is a cyclic number.

It is not a de Polignac number, because 123455666679 - 2³ = 123455666671 is a prime.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123455666671) 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, 20575944444 + ... + 20575944449.

It is an arithmetic number, because the mean of its divisors is an integer number (41151888894).

Almost surely, 2^123455666679 is an apocalyptic number.

123455666679 is a deficient number, since it is larger than the sum of its proper divisors (41151888897).

123455666679 is an equidigital number, since it uses as much as digits as its factorization.

123455666679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41151888896.

The product of its digits is 48988800, while the sum is 60.

The spelling of 123455666679 in words is "one hundred twenty-three billion, four hundred fifty-five million, six hundred sixty-six thousand, six hundred seventy-nine".