123426455661 has 24 divisors (see below), whose sum is σ = 183162324384. Its totient is φ = 80033637600.

The previous prime is 123426455641. The next prime is 123426455671. The reversal of 123426455661 is 166554624321.

123426455661 is a `hidden beast` number, since 1 + 2 + 3 + 42 + 6 + 45 + 566 + 1 = 666.

It is not a de Polignac number, because 123426455661 - 2⁹ = 123426455149 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123426455641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 960886 + ... + 1081736.

It is an arithmetic number, because the mean of its divisors is an integer number (7631763516).

Almost surely, 2^123426455661 is an apocalyptic number.

It is an amenable number.

123426455661 is a deficient number, since it is larger than the sum of its proper divisors (59735868723).

123426455661 is a wasteful number, since it uses less digits than its factorization.

123426455661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123961 (or 123958 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 45.

The spelling of 123426455661 in words is "one hundred twenty-three billion, four hundred twenty-six million, four hundred fifty-five thousand, six hundred sixty-one".