77608494857 has 4 divisors (see below), whose sum is σ = 77609251536. Its totient is φ = 77607738180.

The previous prime is 77608494851. The next prime is 77608494863. The reversal of 77608494857 is 75849480677.

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, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (77608494851) and next prime (77608494863).

It is a cyclic number.

It is not a de Polignac number, because 77608494857 - 2⁴ = 77608494841 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77608494793 and 77608494802.

It is not an unprimeable number, because it can be changed into a prime (77608494851) 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, 194819 + ... + 439512.

It is an arithmetic number, because the mean of its divisors is an integer number (19402312884).

Almost surely, 2^77608494857 is an apocalyptic number.

It is an amenable number.

77608494857 is a deficient number, since it is larger than the sum of its proper divisors (756679).

77608494857 is a wasteful number, since it uses less digits than its factorization.

77608494857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 756678.

The product of its (nonzero) digits is 94832640, while the sum is 65.

The spelling of 77608494857 in words is "seventy-seven billion, six hundred eight million, four hundred ninety-four thousand, eight hundred fifty-seven".