77720045523 has 8 divisors (see below), whose sum is σ = 103740481536. Its totient is φ = 51756486600.

The previous prime is 77720045521. The next prime is 77720045537. The reversal of 77720045523 is 32554002777.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 77720045523 - 2¹ = 77720045521 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 14216083 + ... + 14221548.

It is an arithmetic number, because the mean of its divisors is an integer number (12967560192).

Almost surely, 2^77720045523 is an apocalyptic number.

77720045523 is a deficient number, since it is larger than the sum of its proper divisors (26020436013).

77720045523 is a wasteful number, since it uses less digits than its factorization.

77720045523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28438545.

The product of its (nonzero) digits is 411600, while the sum is 42.

The spelling of 77720045523 in words is "seventy-seven billion, seven hundred twenty million, forty-five thousand, five hundred twenty-three".