77971257579 has 8 divisors (see below), whose sum is σ = 104720521680. Its totient is φ = 51601415936.

The previous prime is 77971257563. The next prime is 77971257583. The reversal of 77971257579 is 97575217977.

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 77971257579 - 2⁴ = 77971257563 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77971257079) 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, 94855134 + ... + 94855955.

It is an arithmetic number, because the mean of its divisors is an integer number (13090065210).

Almost surely, 2^77971257579 is an apocalyptic number.

77971257579 is a deficient number, since it is larger than the sum of its proper divisors (26749264101).

77971257579 is a wasteful number, since it uses less digits than its factorization.

77971257579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189711229.

The product of its digits is 68068350, while the sum is 66.

The spelling of 77971257579 in words is "seventy-seven billion, nine hundred seventy-one million, two hundred fifty-seven thousand, five hundred seventy-nine".