77331434647 has 4 divisors (see below), whose sum is σ = 80693670960. Its totient is φ = 73969198336.

The previous prime is 77331434641. The next prime is 77331434683. The reversal of 77331434647 is 74643413377.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77331434647 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77331434647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77331434641) 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, 1681118122 + ... + 1681118167.

It is an arithmetic number, because the mean of its divisors is an integer number (20173417740).

Almost surely, 2^77331434647 is an apocalyptic number.

77331434647 is a deficient number, since it is larger than the sum of its proper divisors (3362236313).

77331434647 is a wasteful number, since it uses less digits than its factorization.

77331434647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3362236312.

The product of its digits is 3556224, while the sum is 49.

The spelling of 77331434647 in words is "seventy-seven billion, three hundred thirty-one million, four hundred thirty-four thousand, six hundred forty-seven".