77982639233 has 4 divisors (see below), whose sum is σ = 77988019668. Its totient is φ = 77977258800.

The previous prime is 77982639211. The next prime is 77982639247. The reversal of 77982639233 is 33293628977.

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 59590668544 + 18391970689 = 244112^2 + 135617^2 .

It is a cyclic number.

It is not a de Polignac number, because 77982639233 - 2⁸ = 77982638977 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 (77982639433) 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, 2668418 + ... + 2697483.

It is an arithmetic number, because the mean of its divisors is an integer number (19497004917).

Almost surely, 2^77982639233 is an apocalyptic number.

It is an amenable number.

77982639233 is a deficient number, since it is larger than the sum of its proper divisors (5380435).

77982639233 is a wasteful number, since it uses less digits than its factorization.

77982639233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5380434.

The product of its digits is 20575296, while the sum is 59.

The spelling of 77982639233 in words is "seventy-seven billion, nine hundred eighty-two million, six hundred thirty-nine thousand, two hundred thirty-three".