77855455877 has 4 divisors (see below), whose sum is σ = 77953142316. Its totient is φ = 77757769440.

The previous prime is 77855455861. The next prime is 77855455891.

It is a happy number.

77855455877 is nontrivially palindromic in base 10.

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 42372575716 + 35482880161 = 205846^2 + 188369^2 .

It is a cyclic number.

It is not a de Polignac number, because 77855455877 - 2⁴ = 77855455861 is a prime.

It is a super-3 number, since 3×77855455877³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77855455807) 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, 48842024 + ... + 48843617.

It is an arithmetic number, because the mean of its divisors is an integer number (19488285579).

Almost surely, 2^77855455877 is an apocalyptic number.

It is an amenable number.

77855455877 is a deficient number, since it is larger than the sum of its proper divisors (97686439).

77855455877 is an equidigital number, since it uses as much as digits as its factorization.

77855455877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97686438.

The product of its digits is 384160000, while the sum is 68.

The spelling of 77855455877 in words is "seventy-seven billion, eight hundred fifty-five million, four hundred fifty-five thousand, eight hundred seventy-seven".