77331702641 has 4 divisors (see below), whose sum is σ = 77467611300. Its totient is φ = 77195793984.

The previous prime is 77331702619. The next prime is 77331702659. The reversal of 77331702641 is 14620713377.

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 35836383025 + 41495319616 = 189305^2 + 203704^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77331702641 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (77331702601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67953476 + ... + 67954613.

It is an arithmetic number, because the mean of its divisors is an integer number (19366902825).

Almost surely, 2^77331702641 is an apocalyptic number.

It is an amenable number.

77331702641 is a deficient number, since it is larger than the sum of its proper divisors (135908659).

77331702641 is a wasteful number, since it uses less digits than its factorization.

77331702641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135908658.

The product of its (nonzero) digits is 148176, while the sum is 41.

The spelling of 77331702641 in words is "seventy-seven billion, three hundred thirty-one million, seven hundred two thousand, six hundred forty-one".