77531242472 has 8 divisors (see below), whose sum is σ = 145371079650. Its totient is φ = 38765621232.

The previous prime is 77531242447. The next prime is 77531242553. The reversal of 77531242472 is 27424213577.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 77231744836 + 299497636 = 277906^2 + 17306^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×77531242472² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4845702647 + ... + 4845702662.

Almost surely, 2^77531242472 is an apocalyptic number.

It is an amenable number.

77531242472 is a deficient number, since it is larger than the sum of its proper divisors (67839837178).

77531242472 is a wasteful number, since it uses less digits than its factorization.

77531242472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9691405315 (or 9691405311 counting only the distinct ones).

The product of its digits is 658560, while the sum is 44.

The spelling of 77531242472 in words is "seventy-seven billion, five hundred thirty-one million, two hundred forty-two thousand, four hundred seventy-two".