78261078645313 has 16 divisors (see below), whose sum is σ = 89081841726720. Its totient is φ = 68296078630656.

The previous prime is 78261078645301. The next prime is 78261078645317. The reversal of 78261078645313 is 31354687016287.

It is a cyclic number.

It is not a de Polignac number, because 78261078645313 - 2¹³ = 78261078637121 is a prime.

It is a super-2 number, since 2×78261078645313² (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 (78261078645317) 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 15 ways as a sum of consecutive naturals, for example, 2577584406 + ... + 2577614767.

It is an arithmetic number, because the mean of its divisors is an integer number (5567615107920).

Almost surely, 2^{78261078645313} is an apocalyptic number.

It is an amenable number.

78261078645313 is a deficient number, since it is larger than the sum of its proper divisors (10820763081407).

78261078645313 is a wasteful number, since it uses less digits than its factorization.

78261078645313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5155199256.

The product of its (nonzero) digits is 40642560, while the sum is 61.

The spelling of 78261078645313 in words is "seventy-eight trillion, two hundred sixty-one billion, seventy-eight million, six hundred forty-five thousand, three hundred thirteen".