77661105622 has 4 divisors (see below), whose sum is σ = 116491658436. Its totient is φ = 38830552810.

The previous prime is 77661105523. The next prime is 77661105623. The reversal of 77661105622 is 22650116677.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22650116677 = 89 ⋅254495693.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77661105623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19415276404 + ... + 19415276407.

It is an arithmetic number, because the mean of its divisors is an integer number (29122914609).

Almost surely, 2^77661105622 is an apocalyptic number.

77661105622 is a deficient number, since it is larger than the sum of its proper divisors (38830552814).

77661105622 is a wasteful number, since it uses less digits than its factorization.

77661105622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38830552813.

The product of its (nonzero) digits is 211680, while the sum is 43.

The spelling of 77661105622 in words is "seventy-seven billion, six hundred sixty-one million, one hundred five thousand, six hundred twenty-two".