77659978393 has 4 divisors (see below), whose sum is σ = 77912942800. Its totient is φ = 77407013988.

The previous prime is 77659978373. The next prime is 77659978397. The reversal of 77659978393 is 39387995677.

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 77659978393 - 2²¹ = 77657881241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77659978397) 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, 126481743 + ... + 126482356.

It is an arithmetic number, because the mean of its divisors is an integer number (19478235700).

Almost surely, 2^77659978393 is an apocalyptic number.

It is an amenable number.

77659978393 is a deficient number, since it is larger than the sum of its proper divisors (252964407).

77659978393 is a wasteful number, since it uses less digits than its factorization.

77659978393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252964406.

The product of its digits is 540101520, while the sum is 73.

The spelling of 77659978393 in words is "seventy-seven billion, six hundred fifty-nine million, nine hundred seventy-eight thousand, three hundred ninety-three".