78501172123 has 8 divisors (see below), whose sum is σ = 87253447536. Its totient is φ = 70018197600.

The previous prime is 78501172069. The next prime is 78501172157. The reversal of 78501172123 is 32127110587.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78501172123 - 2¹³ = 78501163931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78501170123) 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 7 ways as a sum of consecutive naturals, for example, 67324608 + ... + 67325773.

It is an arithmetic number, because the mean of its divisors is an integer number (10906680942).

Almost surely, 2^78501172123 is an apocalyptic number.

78501172123 is a deficient number, since it is larger than the sum of its proper divisors (8752275413).

78501172123 is a wasteful number, since it uses less digits than its factorization.

78501172123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134650445.

The product of its (nonzero) digits is 23520, while the sum is 37.

The spelling of 78501172123 in words is "seventy-eight billion, five hundred one million, one hundred seventy-two thousand, one hundred twenty-three".