77686963691 has 4 divisors (see below), whose sum is σ = 77708410032. Its totient is φ = 77665517352.

The previous prime is 77686963663. The next prime is 77686963699. The reversal of 77686963691 is 19636968677.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 77686963691 - 2¹⁴ = 77686947307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77686963699) 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, 10717736 + ... + 10724981.

It is an arithmetic number, because the mean of its divisors is an integer number (19427102508).

Almost surely, 2^77686963691 is an apocalyptic number.

77686963691 is a deficient number, since it is larger than the sum of its proper divisors (21446341).

77686963691 is a wasteful number, since it uses less digits than its factorization.

77686963691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21446340.

The product of its digits is 123451776, while the sum is 68.

The spelling of 77686963691 in words is "seventy-seven billion, six hundred eighty-six million, nine hundred sixty-three thousand, six hundred ninety-one".