181977794145 has 48 divisors (see below), whose sum is σ = 360520672512. Its totient is φ = 83182619520.

The previous prime is 181977794143. The next prime is 181977794149. The reversal of 181977794145 is 541497779181.

181977794145 is a `hidden beast` number, since 1 + 81 + 9 + 77 + 79 + 414 + 5 = 666.

181977794145 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 181977794145 - 2¹ = 181977794143 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 (181977794143) 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 47 ways as a sum of consecutive naturals, for example, 5610675 + ... + 5643015.

It is an arithmetic number, because the mean of its divisors is an integer number (7510847344).

Almost surely, 2^181977794145 is an apocalyptic number.

181977794145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

181977794145 is a deficient number, since it is larger than the sum of its proper divisors (178542878367).

181977794145 is a wasteful number, since it uses less digits than its factorization.

181977794145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50222 (or 50219 counting only the distinct ones).

The product of its digits is 17781120, while the sum is 63.

The spelling of 181977794145 in words is "one hundred eighty-one billion, nine hundred seventy-seven million, seven hundred ninety-four thousand, one hundred forty-five".