77958685977 has 8 divisors (see below), whose sum is σ = 104047529664. Its totient is φ = 51921149808.

The previous prime is 77958685949. The next prime is 77958685997.

77958685977 is nontrivially palindromic in base 10.

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

It is not a de Polignac number, because 77958685977 - 2¹² = 77958681881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77958685997) 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, 12823333 + ... + 12829410.

It is an arithmetic number, because the mean of its divisors is an integer number (13005941208).

Almost surely, 2^77958685977 is an apocalyptic number.

It is an amenable number.

77958685977 is a deficient number, since it is larger than the sum of its proper divisors (26088843687).

77958685977 is a wasteful number, since it uses less digits than its factorization.

77958685977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25653759.

The product of its digits is 1867017600, while the sum is 78.

The spelling of 77958685977 in words is "seventy-seven billion, nine hundred fifty-eight million, six hundred eighty-five thousand, nine hundred seventy-seven".