77836016669 has 4 divisors (see below), whose sum is σ = 77913159420. Its totient is φ = 77758873920.

The previous prime is 77836016627. The next prime is 77836016701. The reversal of 77836016669 is 96661063877.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 27834584569 + 50001432100 = 166837^2 + 223610^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77836016669 is a prime.

It is a super-2 number, since 2×77836016669² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77836018669) 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, 38569862 + ... + 38571879.

It is an arithmetic number, because the mean of its divisors is an integer number (19478289855).

Almost surely, 2^77836016669 is an apocalyptic number.

It is an amenable number.

77836016669 is a deficient number, since it is larger than the sum of its proper divisors (77142751).

77836016669 is a wasteful number, since it uses less digits than its factorization.

77836016669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77142750.

The product of its (nonzero) digits is 13716864, while the sum is 59.

The spelling of 77836016669 in words is "seventy-seven billion, eight hundred thirty-six million, sixteen thousand, six hundred sixty-nine".