77811016947 has 4 divisors (see below), whose sum is σ = 103748022600. Its totient is φ = 51874011296.

The previous prime is 77811016891. The next prime is 77811016967. The reversal of 77811016947 is 74961011877.

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 77811016947 - 2⁸ = 77811016691 is a prime.

It is a super-3 number, since 3×77811016947³ (a number of 34 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 77811016947.

It is not an unprimeable number, because it can be changed into a prime (77811016967) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12968502822 + ... + 12968502827.

It is an arithmetic number, because the mean of its divisors is an integer number (25937005650).

Almost surely, 2^77811016947 is an apocalyptic number.

77811016947 is a deficient number, since it is larger than the sum of its proper divisors (25937005653).

77811016947 is a wasteful number, since it uses less digits than its factorization.

77811016947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25937005652.

The product of its (nonzero) digits is 592704, while the sum is 51.

The spelling of 77811016947 in words is "seventy-seven billion, eight hundred eleven million, sixteen thousand, nine hundred forty-seven".