78235440324131 has 4 divisors (see below), whose sum is σ = 78389144529600. Its totient is φ = 78081736118664.

The previous prime is 78235440324109. The next prime is 78235440324143. The reversal of 78235440324131 is 13142304453287.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78235440324131 - 2²² = 78235436129827 is a prime.

It is a super-2 number, since 2×78235440324131² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78235440384131) 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 3 ways as a sum of consecutive naturals, for example, 76852101971 + ... + 76852102988.

It is an arithmetic number, because the mean of its divisors is an integer number (19597286132400).

Almost surely, 2^{78235440324131} is an apocalyptic number.

78235440324131 is a deficient number, since it is larger than the sum of its proper divisors (153704205469).

78235440324131 is a wasteful number, since it uses less digits than its factorization.

78235440324131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153704205468.

The product of its (nonzero) digits is 1935360, while the sum is 47.

The spelling of 78235440324131 in words is "seventy-eight trillion, two hundred thirty-five billion, four hundred forty million, three hundred twenty-four thousand, one hundred thirty-one".