78338535685 has 16 divisors (see below), whose sum is σ = 96380015616. Its totient is φ = 61098692608.

The previous prime is 78338535661. The next prime is 78338535689. The reversal of 78338535685 is 58653583387.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 78338535685 - 2¹⁵ = 78338502917 is a prime.

It is a super-2 number, since 2×78338535685² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78338535689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 588157 + ... + 708946.

It is an arithmetic number, because the mean of its divisors is an integer number (6023750976).

Almost surely, 2^78338535685 is an apocalyptic number.

It is an amenable number.

78338535685 is a deficient number, since it is larger than the sum of its proper divisors (18041479931).

78338535685 is a wasteful number, since it uses less digits than its factorization.

78338535685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1297412.

The product of its digits is 72576000, while the sum is 61.

The spelling of 78338535685 in words is "seventy-eight billion, three hundred thirty-eight million, five hundred thirty-five thousand, six hundred eighty-five".