77825412377 has 4 divisors (see below), whose sum is σ = 77839031076. Its totient is φ = 77811793680.

The previous prime is 77825412359. The next prime is 77825412397. The reversal of 77825412377 is 77321452877.

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: 77321452877 = 23 ⋅3361802299.

It can be written as a sum of positive squares in 2 ways, for example, as 18863374336 + 58962038041 = 137344^2 + 242821^2 .

It is a cyclic number.

It is not a de Polignac number, because 77825412377 - 2²² = 77821218073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77825412307) 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, 6800774 + ... + 6812207.

It is an arithmetic number, because the mean of its divisors is an integer number (19459757769).

Almost surely, 2^77825412377 is an apocalyptic number.

It is an amenable number.

77825412377 is a deficient number, since it is larger than the sum of its proper divisors (13618699).

77825412377 is a wasteful number, since it uses less digits than its factorization.

77825412377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13618698.

The product of its digits is 4609920, while the sum is 53.

The spelling of 77825412377 in words is "seventy-seven billion, eight hundred twenty-five million, four hundred twelve thousand, three hundred seventy-seven".