78507203133855 has 16 divisors (see below), whose sum is σ = 129006431096544. Its totient is φ = 40738872977280.

The previous prime is 78507203133851. The next prime is 78507203133881. The reversal of 78507203133855 is 55833130270587.

It is not a de Polignac number, because 78507203133855 - 2² = 78507203133851 is a prime.

It is a super-2 number, since 2×78507203133855² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78507203133795 and 78507203133804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78507203133851) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70727209476 + ... + 70727210585.

It is an arithmetic number, because the mean of its divisors is an integer number (8062901943534).

Almost surely, 2^{78507203133855} is an apocalyptic number.

78507203133855 is a deficient number, since it is larger than the sum of its proper divisors (50499227962689).

78507203133855 is a wasteful number, since it uses less digits than its factorization.

78507203133855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141454420106.

The product of its (nonzero) digits is 21168000, while the sum is 57.

The spelling of 78507203133855 in words is "seventy-eight trillion, five hundred seven billion, two hundred three million, one hundred thirty-three thousand, eight hundred fifty-five".