78148678750121 has 32 divisors (see below), whose sum is σ = 90469322496000. Its totient is φ = 66118637168640.

The previous prime is 78148678750091. The next prime is 78148678750123. The reversal of 78148678750121 is 12105787684187.

It is not a de Polignac number, because 78148678750121 - 2³⁴ = 78131498880937 is a prime.

It is a super-3 number, since 3×78148678750121³ (a number of 43 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (78148678750123) 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 31 ways as a sum of consecutive naturals, for example, 3279274676 + ... + 3279298506.

It is an arithmetic number, because the mean of its divisors is an integer number (2827166328000).

Almost surely, 2^{78148678750121} is an apocalyptic number.

It is an amenable number.

78148678750121 is a deficient number, since it is larger than the sum of its proper divisors (12320643745879).

78148678750121 is a wasteful number, since it uses less digits than its factorization.

78148678750121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28709.

The product of its (nonzero) digits is 42147840, while the sum is 65.

The spelling of 78148678750121 in words is "seventy-eight trillion, one hundred forty-eight billion, six hundred seventy-eight million, seven hundred fifty thousand, one hundred twenty-one".