78693544660 has 12 divisors (see below), whose sum is σ = 165256443828. Its totient is φ = 31477417856.

The previous prime is 78693544621. The next prime is 78693544661. The reversal of 78693544660 is 6644539687.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 56155728784 + 22537815876 = 236972^2 + 150126^2 .

It is a junction number, because it is equal to n+sod(n) for n = 78693544595 and 78693544604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78693544661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1967338597 + ... + 1967338636.

It is an arithmetic number, because the mean of its divisors is an integer number (13771370319).

Almost surely, 2^78693544660 is an apocalyptic number.

It is an amenable number.

78693544660 is an abundant number, since it is smaller than the sum of its proper divisors (86562899168).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78693544660 is a wasteful number, since it uses less digits than its factorization.

78693544660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3934677242 (or 3934677240 counting only the distinct ones).

The product of its (nonzero) digits is 26127360, while the sum is 58.

The spelling of 78693544660 in words is "seventy-eight billion, six hundred ninety-three million, five hundred forty-four thousand, six hundred sixty".