77987994453 has 64 divisors (see below), whose sum is σ = 123369523200. Its totient is φ = 48549300480.

The previous prime is 77987994449. The next prime is 77987994463. The reversal of 77987994453 is 35449978977.

77987994453 is a `hidden beast` number, since 7 + 7 + 9 + 87 + 9 + 94 + 453 = 666.

It is not a de Polignac number, because 77987994453 - 2² = 77987994449 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77987994463) by changing a digit.

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 in 63 ways as a sum of consecutive naturals, for example, 20734093 + ... + 20737853.

It is an arithmetic number, because the mean of its divisors is an integer number (1927648800).

Almost surely, 2^77987994453 is an apocalyptic number.

It is an amenable number.

77987994453 is a deficient number, since it is larger than the sum of its proper divisors (45381528747).

77987994453 is a wasteful number, since it uses less digits than its factorization.

77987994453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4359 (or 4353 counting only the distinct ones).

The product of its digits is 480090240, while the sum is 72.

The spelling of 77987994453 in words is "seventy-seven billion, nine hundred eighty-seven million, nine hundred ninety-four thousand, four hundred fifty-three".