78112102001978 has 32 divisors (see below), whose sum is σ = 134595405432000. Its totient is φ = 33624729313920.

The previous prime is 78112102001977. The next prime is 78112102002017. The reversal of 78112102001978 is 87910020121187.

It is a happy number.

It is a super-2 number, since 2×78112102001978² (a number of 29 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78112102001977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32335643 + ... + 34667246.

It is an arithmetic number, because the mean of its divisors is an integer number (4206106419750).

Almost surely, 2^{78112102001978} is an apocalyptic number.

78112102001978 is a deficient number, since it is larger than the sum of its proper divisors (56483303430022).

78112102001978 is a wasteful number, since it uses less digits than its factorization.

78112102001978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67005710.

The product of its (nonzero) digits is 112896, while the sum is 47.

The spelling of 78112102001978 in words is "seventy-eight trillion, one hundred twelve billion, one hundred two million, one thousand, nine hundred seventy-eight".