18878741778 has 32 divisors (see below), whose sum is σ = 40667792256. Its totient is φ = 5808002688.

The previous prime is 18878741771. The next prime is 18878741789. The reversal of 18878741778 is 87714787881.

18878741778 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×18878741778² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18878741771) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 725326 + ... + 750902.

It is an arithmetic number, because the mean of its divisors is an integer number (1270868508).

Almost surely, 2^18878741778 is an apocalyptic number.

18878741778 is an abundant number, since it is smaller than the sum of its proper divisors (21789050478).

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

18878741778 is a wasteful number, since it uses less digits than its factorization.

18878741778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35058.

The product of its digits is 39337984, while the sum is 66.

The spelling of 18878741778 in words is "eighteen billion, eight hundred seventy-eight million, seven hundred forty-one thousand, seven hundred seventy-eight".