77506723018 has 4 divisors (see below), whose sum is σ = 116260084530. Its totient is φ = 38753361508.

The previous prime is 77506723013. The next prime is 77506723031. The reversal of 77506723018 is 81032760577.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81032760577 = 71 ⋅1141306487.

It can be written as a sum of positive squares in only one way, i.e., 53533465129 + 23973257889 = 231373^2 + 154833^2 .

It is a super-2 number, since 2×77506723018² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (77506723013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19376680753 + ... + 19376680756.

Almost surely, 2^77506723018 is an apocalyptic number.

77506723018 is a deficient number, since it is larger than the sum of its proper divisors (38753361512).

77506723018 is a wasteful number, since it uses less digits than its factorization.

77506723018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38753361511.

The product of its (nonzero) digits is 493920, while the sum is 46.

The spelling of 77506723018 in words is "seventy-seven billion, five hundred six million, seven hundred twenty-three thousand, eighteen".