77381685202 has 4 divisors (see below), whose sum is σ = 116072527806. Its totient is φ = 38690842600.

The previous prime is 77381685179. The next prime is 77381685211. The reversal of 77381685202 is 20258618377.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20258618377 = 251 ⋅80711627.

It can be written as a sum of positive squares in only one way, i.e., 58645824561 + 18735860641 = 242169^2 + 136879^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 19345421299 + ... + 19345421302.

Almost surely, 2^77381685202 is an apocalyptic number.

77381685202 is a deficient number, since it is larger than the sum of its proper divisors (38690842604).

77381685202 is a wasteful number, since it uses less digits than its factorization.

77381685202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38690842603.

The product of its (nonzero) digits is 1128960, while the sum is 49.

The spelling of 77381685202 in words is "seventy-seven billion, three hundred eighty-one million, six hundred eighty-five thousand, two hundred two".