77904213523 has 4 divisors (see below), whose sum is σ = 77904862648. Its totient is φ = 77903564400.

The previous prime is 77904213451. The next prime is 77904213553. The reversal of 77904213523 is 32531240977.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77904213523 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77904213523.

It is not an unprimeable number, because it can be changed into a prime (77904213553) 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 3 ways as a sum of consecutive naturals, for example, 86178 + ... + 404023.

It is an arithmetic number, because the mean of its divisors is an integer number (19476215662).

Almost surely, 2^77904213523 is an apocalyptic number.

77904213523 is a deficient number, since it is larger than the sum of its proper divisors (649125).

77904213523 is a wasteful number, since it uses less digits than its factorization.

77904213523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 649124.

The product of its (nonzero) digits is 317520, while the sum is 43.

The spelling of 77904213523 in words is "seventy-seven billion, nine hundred four million, two hundred thirteen thousand, five hundred twenty-three".