78504338317537 has 4 divisors (see below), whose sum is σ = 85641096346416. Its totient is φ = 71367580288660.

The previous prime is 78504338317523. The next prime is 78504338317577. The reversal of 78504338317537 is 73571383340587.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78504338317537 is a prime.

It is a super-2 number, since 2×78504338317537² (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 (78504338317577) 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, 3568379014423 + ... + 3568379014444.

It is an arithmetic number, because the mean of its divisors is an integer number (21410274086604).

Almost surely, 2^{78504338317537} is an apocalyptic number.

It is an amenable number.

78504338317537 is a deficient number, since it is larger than the sum of its proper divisors (7136758028879).

78504338317537 is a wasteful number, since it uses less digits than its factorization.

78504338317537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7136758028878.

The product of its (nonzero) digits is 177811200, while the sum is 64.

The spelling of 78504338317537 in words is "seventy-eight trillion, five hundred four billion, three hundred thirty-eight million, three hundred seventeen thousand, five hundred thirty-seven".