77957694674 has 4 divisors (see below), whose sum is σ = 116936542014. Its totient is φ = 38978847336.

The previous prime is 77957694673. The next prime is 77957694691. The reversal of 77957694674 is 47649675977.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 47649675977 = 19 ⋅2507877683.

It can be written as a sum of positive squares in only one way, i.e., 56522685025 + 21435009649 = 237745^2 + 146407^2 .

It is a junction number, because it is equal to n+sod(n) for n = 77957694598 and 77957694607.

It is not an unprimeable number, because it can be changed into a prime (77957694671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19489423667 + ... + 19489423670.

Almost surely, 2^77957694674 is an apocalyptic number.

77957694674 is a deficient number, since it is larger than the sum of its proper divisors (38978847340).

77957694674 is a wasteful number, since it uses less digits than its factorization.

77957694674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38978847339.

The product of its digits is 560105280, while the sum is 71.

The spelling of 77957694674 in words is "seventy-seven billion, nine hundred fifty-seven million, six hundred ninety-four thousand, six hundred seventy-four".