76888634945 has 4 divisors (see below), whose sum is σ = 92266361940. Its totient is φ = 61510907952.

The previous prime is 76888634929. The next prime is 76888634947. The reversal of 76888634945 is 54943688867.

It is a Cunningham number, because it is equal to 277288²+1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54943688867 = 347 ⋅158339161.

It can be written as a sum of positive squares in 2 ways, for example, as 27679642384 + 49208992561 = 166372^2 + 221831^2 .

It is a cyclic number.

It is not a de Polignac number, because 76888634945 - 2⁴ = 76888634929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (76888634947) 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, 7688863490 + ... + 7688863499.

It is an arithmetic number, because the mean of its divisors is an integer number (23066590485).

Almost surely, 2^76888634945 is an apocalyptic number.

It is an amenable number.

76888634945 is a deficient number, since it is larger than the sum of its proper divisors (15377726995).

76888634945 is a wasteful number, since it uses less digits than its factorization.

76888634945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15377726994.

The product of its digits is 278691840, while the sum is 68.

The spelling of 76888634945 in words is "seventy-six billion, eight hundred eighty-eight million, six hundred thirty-four thousand, nine hundred forty-five".