77815786213 has 8 divisors (see below), whose sum is σ = 89883475200. Its totient is φ = 66580351680.

The previous prime is 77815786211. The next prime is 77815786231. The reversal of 77815786213 is 31268751877.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77815786213 - 2¹ = 77815786211 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77815786211) 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 7 ways as a sum of consecutive naturals, for example, 208063413 + ... + 208063786.

It is an arithmetic number, because the mean of its divisors is an integer number (11235434400).

Almost surely, 2^77815786213 is an apocalyptic number.

It is an amenable number.

77815786213 is a deficient number, since it is larger than the sum of its proper divisors (12067688987).

77815786213 is a wasteful number, since it uses less digits than its factorization.

77815786213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416127227.

The product of its digits is 3951360, while the sum is 55.

The spelling of 77815786213 in words is "seventy-seven billion, eight hundred fifteen million, seven hundred eighty-six thousand, two hundred thirteen".