77865624728345 has 8 divisors (see below), whose sum is σ = 93438846897864. Its totient is φ = 62292434966784.

The previous prime is 77865624728321. The next prime is 77865624728393. The reversal of 77865624728345 is 54382742656877.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 8630527826176 + 69235096902169 = 2937776^2 + 8320763^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77865624728345 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2458784 + ... + 12719153.

It is an arithmetic number, because the mean of its divisors is an integer number (11679855862233).

Almost surely, 2^{77865624728345} is an apocalyptic number.

It is an amenable number.

77865624728345 is a deficient number, since it is larger than the sum of its proper divisors (15573222169519).

77865624728345 is a wasteful number, since it uses less digits than its factorization.

77865624728345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16203979.

The product of its digits is 3793305600, while the sum is 74.

The spelling of 77865624728345 in words is "seventy-seven trillion, eight hundred sixty-five billion, six hundred twenty-four million, seven hundred twenty-eight thousand, three hundred forty-five".