77720045525 has 12 divisors (see below), whose sum is σ = 96776097600. Its totient is φ = 61915880880.

The previous prime is 77720045521. The next prime is 77720045537. The reversal of 77720045525 is 52554002777.

It is not a de Polignac number, because 77720045525 - 2² = 77720045521 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77720045521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6497795 + ... + 6509744.

It is an arithmetic number, because the mean of its divisors is an integer number (8064674800).

Almost surely, 2^77720045525 is an apocalyptic number.

It is an amenable number.

77720045525 is a deficient number, since it is larger than the sum of its proper divisors (19056052075).

77720045525 is a wasteful number, since it uses less digits than its factorization.

77720045525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13007788 (or 13007783 counting only the distinct ones).

The product of its (nonzero) digits is 686000, while the sum is 44.

The spelling of 77720045525 in words is "seventy-seven billion, seven hundred twenty million, forty-five thousand, five hundred twenty-five".