77850873418 has 4 divisors (see below), whose sum is σ = 116776310130. Its totient is φ = 38925436708.

The previous prime is 77850873413. The next prime is 77850873421. The reversal of 77850873418 is 81437805877.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81437805877 = 191 ⋅426375947.

It can be written as a sum of positive squares in only one way, i.e., 43331834569 + 34519038849 = 208163^2 + 185793^2 .

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (77850873413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19462718353 + ... + 19462718356.

Almost surely, 2^77850873418 is an apocalyptic number.

77850873418 is a deficient number, since it is larger than the sum of its proper divisors (38925436712).

77850873418 is a wasteful number, since it uses less digits than its factorization.

77850873418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38925436711.

The product of its (nonzero) digits is 10536960, while the sum is 58.

The spelling of 77850873418 in words is "seventy-seven billion, eight hundred fifty million, eight hundred seventy-three thousand, four hundred eighteen".