77921013683 has 2 divisors, whose sum is σ = 77921013684. Its totient is φ = 77921013682.

The previous prime is 77921013659. The next prime is 77921013701. The reversal of 77921013683 is 38631012977.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77921013683 - 2²⁰ = 77919965107 is a prime.

It is not a weakly prime, because it can be changed into another prime (77921010683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38960506841 + 38960506842.

It is an arithmetic number, because the mean of its divisors is an integer number (38960506842).

Almost surely, 2^77921013683 is an apocalyptic number.

77921013683 is a deficient number, since it is larger than the sum of its proper divisors (1).

77921013683 is an equidigital number, since it uses as much as digits as its factorization.

77921013683 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 381024, while the sum is 47.

The spelling of 77921013683 in words is "seventy-seven billion, nine hundred twenty-one million, thirteen thousand, six hundred eighty-three".