78388851061 has 4 divisors (see below), whose sum is σ = 78458284300. Its totient is φ = 78319417824.

The previous prime is 78388851053. The next prime is 78388851067. The reversal of 78388851061 is 16015888387.

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 41560938225 + 36827912836 = 203865^2 + 191906^2 .

It is a cyclic number.

It is not a de Polignac number, because 78388851061 - 2³ = 78388851053 is a prime.

It is a super-2 number, since 2×78388851061² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78388850993 and 78388851011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78388851067) 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 3 ways as a sum of consecutive naturals, for example, 34714926 + ... + 34717183.

It is an arithmetic number, because the mean of its divisors is an integer number (19614571075).

Almost surely, 2^78388851061 is an apocalyptic number.

It is an amenable number.

78388851061 is a deficient number, since it is larger than the sum of its proper divisors (69433239).

78388851061 is a wasteful number, since it uses less digits than its factorization.

78388851061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69433238.

The product of its (nonzero) digits is 2580480, while the sum is 55.

The spelling of 78388851061 in words is "seventy-eight billion, three hundred eighty-eight million, eight hundred fifty-one thousand, sixty-one".