78177514660013 has 4 divisors (see below), whose sum is σ = 78424131425820. Its totient is φ = 77930897894208.

The previous prime is 78177514660009. The next prime is 78177514660027. The reversal of 78177514660013 is 31006641577187.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2189281262884 + 75988233397129 = 1479622^2 + 8717123^2 .

It is a cyclic number.

It is not a de Polignac number, because 78177514660013 - 2² = 78177514660009 is a prime.

It is a super-3 number, since 3×78177514660013³ (a number of 43 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78177514660033) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123308382428 + ... + 123308383061.

It is an arithmetic number, because the mean of its divisors is an integer number (19606032856455).

Almost surely, 2^{78177514660013} is an apocalyptic number.

It is an amenable number.

78177514660013 is a deficient number, since it is larger than the sum of its proper divisors (246616765807).

78177514660013 is a wasteful number, since it uses less digits than its factorization.

78177514660013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246616765806.

The product of its (nonzero) digits is 5927040, while the sum is 56.

The spelling of 78177514660013 in words is "seventy-eight trillion, one hundred seventy-seven billion, five hundred fourteen million, six hundred sixty thousand, thirteen".