55577777 has 8 divisors (see below), whose sum is σ = 59097600. Its totient is φ = 52085824.

The previous prime is 55577719. The next prime is 55577789. The reversal of 55577777 is 77777555.

It is a happy number.

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

It is not a de Polignac number, because 55577777 - 2¹⁶ = 55512241 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (55577477) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2777 + ... + 10902.

It is an arithmetic number, because the mean of its divisors is an integer number (7387200).

Almost surely, 2^55577777 is an apocalyptic number.

It is an amenable number.

55577777 is a deficient number, since it is larger than the sum of its proper divisors (3519823).

55577777 is a wasteful number, since it uses less digits than its factorization.

55577777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13935.

The product of its digits is 2100875, while the sum is 50.

The square root of 55577777 is about 7455.0504357784. The cubic root of 55577777 is about 381.6222818108.

The spelling of 55577777 in words is "fifty-five million, five hundred seventy-seven thousand, seven hundred seventy-seven".