77805087145 has 8 divisors (see below), whose sum is σ = 93367652040. Its totient is φ = 62243038080.

The previous prime is 77805087137. The next prime is 77805087167. The reversal of 77805087145 is 54178050877.

It can be written as a sum of positive squares in 4 ways, for example, as 25082957376 + 52722129769 = 158376^2 + 229613^2 .

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

It is not a de Polignac number, because 77805087145 - 2³ = 77805087137 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77805087092 and 77805087101.

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, 400525 + ... + 562165.

It is an arithmetic number, because the mean of its divisors is an integer number (11670956505).

Almost surely, 2^77805087145 is an apocalyptic number.

It is an amenable number.

77805087145 is a deficient number, since it is larger than the sum of its proper divisors (15562564895).

77805087145 is a wasteful number, since it uses less digits than its factorization.

77805087145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257915.

The product of its (nonzero) digits is 2195200, while the sum is 52.

The spelling of 77805087145 in words is "seventy-seven billion, eight hundred five million, eighty-seven thousand, one hundred forty-five".