77912297546 has 4 divisors (see below), whose sum is σ = 116868446322. Its totient is φ = 38956148772.

The previous prime is 77912297539. The next prime is 77912297549. The reversal of 77912297546 is 64579221977.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 73992160225 + 3920137321 = 272015^2 + 62611^2 .

It is a super-2 number, since 2×77912297546² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (77912297549) 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, 19478074385 + ... + 19478074388.

Almost surely, 2^77912297546 is an apocalyptic number.

77912297546 is a deficient number, since it is larger than the sum of its proper divisors (38956148776).

77912297546 is a wasteful number, since it uses less digits than its factorization.

77912297546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38956148775.

The product of its digits is 13335840, while the sum is 59.

The spelling of 77912297546 in words is "seventy-seven billion, nine hundred twelve million, two hundred ninety-seven thousand, five hundred forty-six".