77516841085 has 4 divisors (see below), whose sum is σ = 93020209308. Its totient is φ = 62013472864.

The previous prime is 77516841053. The next prime is 77516841089. The reversal of 77516841085 is 58014861577.

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

It can be written as a sum of positive squares in 2 ways, for example, as 42548963076 + 34967878009 = 206274^2 + 186997^2 .

It is a cyclic number.

It is not a de Polignac number, because 77516841085 - 2⁵ = 77516841053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77516841089) 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, 7751684104 + ... + 7751684113.

It is an arithmetic number, because the mean of its divisors is an integer number (23255052327).

Almost surely, 2^77516841085 is an apocalyptic number.

It is an amenable number.

77516841085 is a deficient number, since it is larger than the sum of its proper divisors (15503368223).

77516841085 is a wasteful number, since it uses less digits than its factorization.

77516841085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15503368222.

The product of its (nonzero) digits is 1881600, while the sum is 52.

The spelling of 77516841085 in words is "seventy-seven billion, five hundred sixteen million, eight hundred forty-one thousand, eighty-five".