78363925609 has 8 divisors (see below), whose sum is σ = 80017249320. Its totient is φ = 76726273536.

The previous prime is 78363925583. The next prime is 78363925621. The reversal of 78363925609 is 90652936387.

It can be written as a sum of positive squares in 4 ways, for example, as 3836563600 + 74527362009 = 61940^2 + 272997^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 78363925609 - 2⁹ = 78363925097 is a prime.

It is a super-2 number, since 2×78363925609² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78363925699) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3907804 + ... + 3927805.

It is an arithmetic number, because the mean of its divisors is an integer number (10002156165).

Almost surely, 2^78363925609 is an apocalyptic number.

It is an amenable number.

78363925609 is a deficient number, since it is larger than the sum of its proper divisors (1653323711).

78363925609 is a wasteful number, since it uses less digits than its factorization.

78363925609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7835819.

The product of its (nonzero) digits is 14696640, while the sum is 58.

The spelling of 78363925609 in words is "seventy-eight billion, three hundred sixty-three million, nine hundred twenty-five thousand, six hundred nine".