55787777 has 2 divisors, whose sum is σ = 55787778. Its totient is φ = 55787776.

The previous prime is 55787759. The next prime is 55787803. The reversal of 55787777 is 77778755.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51394561 + 4393216 = 7169^2 + 2096^2 .

It is a cyclic number.

It is not a de Polignac number, because 55787777 - 2⁶ = 55787713 is a prime.

It is a super-2 number, since 2×55787777² = 6224552125203458, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55787737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27893888 + 27893889.

It is an arithmetic number, because the mean of its divisors is an integer number (27893889).

Almost surely, 2^55787777 is an apocalyptic number.

It is an amenable number.

55787777 is a deficient number, since it is larger than the sum of its proper divisors (1).

55787777 is an equidigital number, since it uses as much as digits as its factorization.

55787777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3361400, while the sum is 53.

The square root of 55787777 is about 7469.1215681632. The cubic root of 55787777 is about 382.1023295204.

The spelling of 55787777 in words is "fifty-five million, seven hundred eighty-seven thousand, seven hundred seventy-seven".