18723126776445 has 144 divisors (see below), whose sum is σ = 40211872346880. Its totient is φ = 7890963784704.

The previous prime is 18723126776437. The next prime is 18723126776449. The reversal of 18723126776445 is 54467762132781.

18723126776445 is a `hidden beast` number, since 1 + 8 + 72 + 31 + 26 + 7 + 76 + 445 = 666.

It is not a de Polignac number, because 18723126776445 - 2³ = 18723126776437 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18723126776449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 42849744 + ... + 43284486.

It is an arithmetic number, because the mean of its divisors is an integer number (279249113520).

Almost surely, 2^{18723126776445} is an apocalyptic number.

18723126776445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18723126776445 is an abundant number, since it is smaller than the sum of its proper divisors (21488745570435).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18723126776445 is a wasteful number, since it uses less digits than its factorization.

18723126776445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435596 (or 435580 counting only the distinct ones).

The product of its digits is 94832640, while the sum is 63.

The spelling of 18723126776445 in words is "eighteen trillion, seven hundred twenty-three billion, one hundred twenty-six million, seven hundred seventy-six thousand, four hundred forty-five".