77912364445 has 4 divisors (see below), whose sum is σ = 93494837340. Its totient is φ = 62329891552.

The previous prime is 77912364443. The next prime is 77912364451. The reversal of 77912364445 is 54446321977.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54446321977 = 31 ⋅1756332967.

It can be written as a sum of positive squares in 2 ways, for example, as 56024049636 + 21888314809 = 236694^2 + 147947^2 .

It is a cyclic number.

It is not a de Polignac number, because 77912364445 - 2¹ = 77912364443 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77912364392 and 77912364401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77912364443) 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, 7791236440 + ... + 7791236449.

It is an arithmetic number, because the mean of its divisors is an integer number (23373709335).

Almost surely, 2^77912364445 is an apocalyptic number.

It is an amenable number.

77912364445 is a deficient number, since it is larger than the sum of its proper divisors (15582472895).

77912364445 is a wasteful number, since it uses less digits than its factorization.

77912364445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15582472894.

The product of its digits is 5080320, while the sum is 52.

The spelling of 77912364445 in words is "seventy-seven billion, nine hundred twelve million, three hundred sixty-four thousand, four hundred forty-five".