78180553239978 has 16 divisors (see below), whose sum is σ = 178698407405760. Its totient is φ = 22337300925696.

The previous prime is 78180553239961. The next prime is 78180553239983. The reversal of 78180553239978 is 87993235508187.

It is a super-2 number, since 2×78180553239978² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 930720871863 + ... + 930720871946.

It is an arithmetic number, because the mean of its divisors is an integer number (11168650462860).

Almost surely, 2^{78180553239978} is an apocalyptic number.

78180553239978 is an abundant number, since it is smaller than the sum of its proper divisors (100517854165782).

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

78180553239978 is a wasteful number, since it uses less digits than its factorization.

78180553239978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1861441743821.

The product of its (nonzero) digits is 914457600, while the sum is 75.

The spelling of 78180553239978 in words is "seventy-eight trillion, one hundred eighty billion, five hundred fifty-three million, two hundred thirty-nine thousand, nine hundred seventy-eight".