78825075009 has 4 divisors (see below), whose sum is σ = 105100100016. Its totient is φ = 52550050004.

The previous prime is 78825074959. The next prime is 78825075031. The reversal of 78825075009 is 90057052887.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78825075009 - 2⁸ = 78825074753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78825075509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13137512499 + ... + 13137512504.

It is an arithmetic number, because the mean of its divisors is an integer number (26275025004).

Almost surely, 2^78825075009 is an apocalyptic number.

It is an amenable number.

78825075009 is a deficient number, since it is larger than the sum of its proper divisors (26275025007).

78825075009 is a wasteful number, since it uses less digits than its factorization.

78825075009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26275025006.

The product of its (nonzero) digits is 1411200, while the sum is 51.

The spelling of 78825075009 in words is "seventy-eight billion, eight hundred twenty-five million, seventy-five thousand, nine".