2017942181978 has 16 divisors (see below), whose sum is σ = 3191059476000. Its totient is φ = 954416855952.

The previous prime is 2017942181977. The next prime is 2017942182019. The reversal of 2017942181978 is 8791812497102.

It is a super-2 number, since 2×2017942181978² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2017942181977) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40266113 + ... + 40316196.

It is an arithmetic number, because the mean of its divisors is an integer number (199441217250).

Almost surely, 2^{2017942181978} is an apocalyptic number.

2017942181978 is a deficient number, since it is larger than the sum of its proper divisors (1173117294022).

2017942181978 is a wasteful number, since it uses less digits than its factorization.

2017942181978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80582989.

The product of its (nonzero) digits is 4064256, while the sum is 59.

The spelling of 2017942181978 in words is "two trillion, seventeen billion, nine hundred forty-two million, one hundred eighty-one thousand, nine hundred seventy-eight".