77777257772 has 6 divisors (see below), whose sum is σ = 136110201108. Its totient is φ = 38888628884.

The previous prime is 77777257757. The next prime is 77777257837. The reversal of 77777257772 is 27775277777.

It is a junction number, because it is equal to n+sod(n) for n = 77777257699 and 77777257708.

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, 9722157218 + ... + 9722157225.

It is an arithmetic number, because the mean of its divisors is an integer number (22685033518).

Almost surely, 2^77777257772 is an apocalyptic number.

It is an amenable number.

77777257772 is a deficient number, since it is larger than the sum of its proper divisors (58332943336).

77777257772 is a wasteful number, since it uses less digits than its factorization.

77777257772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19444314447 (or 19444314445 counting only the distinct ones).

The product of its digits is 115296020, while the sum is 65.

The spelling of 77777257772 in words is "seventy-seven billion, seven hundred seventy-seven million, two hundred fifty-seven thousand, seven hundred seventy-two".