77955577012 has 6 divisors (see below), whose sum is σ = 136422259778. Its totient is φ = 38977788504.

The previous prime is 77955577003. The next prime is 77955577039. The reversal of 77955577012 is 21077555977.

It can be written as a sum of positive squares in only one way, i.e., 59553569296 + 18402007716 = 244036^2 + 135654^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9744447123 + ... + 9744447130.

Almost surely, 2^77955577012 is an apocalyptic number.

It is an amenable number.

77955577012 is a deficient number, since it is larger than the sum of its proper divisors (58466682766).

77955577012 is a wasteful number, since it uses less digits than its factorization.

77955577012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19488894257 (or 19488894255 counting only the distinct ones).

The product of its (nonzero) digits is 5402250, while the sum is 55.

The spelling of 77955577012 in words is "seventy-seven billion, nine hundred fifty-five million, five hundred seventy-seven thousand, twelve".