78537474738845 has 8 divisors (see below), whose sum is σ = 94262484115800. Its totient is φ = 62818303504960.

The previous prime is 78537474738823. The next prime is 78537474738881. The reversal of 78537474738845 is 54883747473587.

It can be written as a sum of positive squares in 4 ways, for example, as 129230184196 + 78408244554649 = 359486^2 + 8854843^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-78537474738845 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78537474738845.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1459506170 + ... + 1459559979.

It is an arithmetic number, because the mean of its divisors is an integer number (11782810514475).

Almost surely, 2^{78537474738845} is an apocalyptic number.

It is an amenable number.

78537474738845 is a deficient number, since it is larger than the sum of its proper divisors (15725009376955).

78537474738845 is a wasteful number, since it uses less digits than its factorization.

78537474738845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2919071535.

The product of its digits is 17702092800, while the sum is 80.

The spelling of 78537474738845 in words is "seventy-eight trillion, five hundred thirty-seven billion, four hundred seventy-four million, seven hundred thirty-eight thousand, eight hundred forty-five".