178492978945 has 4 divisors (see below), whose sum is σ = 214191574740. Its totient is φ = 142794383152.

The previous prime is 178492978933. The next prime is 178492979029. The reversal of 178492978945 is 549879294871.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 549879294871 = 71 ⋅7744778801.

It can be written as a sum of positive squares in 2 ways, for example, as 102686920704 + 75806058241 = 320448^2 + 275329^2 .

It is a cyclic number.

It is not a de Polignac number, because 178492978945 - 2⁵ = 178492978913 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17849297890 + ... + 17849297899.

It is an arithmetic number, because the mean of its divisors is an integer number (53547893685).

Almost surely, 2^178492978945 is an apocalyptic number.

It is an amenable number.

178492978945 is a deficient number, since it is larger than the sum of its proper divisors (35698595795).

178492978945 is an equidigital number, since it uses as much as digits as its factorization.

178492978945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35698595794.

The product of its digits is 365783040, while the sum is 73.

The spelling of 178492978945 in words is "one hundred seventy-eight billion, four hundred ninety-two million, nine hundred seventy-eight thousand, nine hundred forty-five".