7998178055 has 16 divisors (see below), whose sum is σ = 10974529344. Its totient is φ = 5481665280.

The previous prime is 7998178021. The next prime is 7998178057. The reversal of 7998178055 is 5508718997.

It is not a de Polignac number, because 7998178055 - 2⁶ = 7998177991 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7998177985 and 7998178003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7998178057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12425 + ... + 127085.

It is an arithmetic number, because the mean of its divisors is an integer number (685908084).

Almost surely, 2^7998178055 is an apocalyptic number.

7998178055 is a deficient number, since it is larger than the sum of its proper divisors (2976351289).

7998178055 is a wasteful number, since it uses less digits than its factorization.

7998178055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116666.

The product of its (nonzero) digits is 6350400, while the sum is 59.

The square root of 7998178055 is about 89432.5335378575. The cubic root of 7998178055 is about 1999.8481597226.

The spelling of 7998178055 in words is "seven billion, nine hundred ninety-eight million, one hundred seventy-eight thousand, fifty-five".