55575757 has 2 divisors, whose sum is σ = 55575758. Its totient is φ = 55575756.

The previous prime is 55575749. The next prime is 55575811. The reversal of 55575757 is 75757555.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35271721 + 20304036 = 5939^2 + 4506^2 .

It is a cyclic number.

It is not a de Polignac number, because 55575757 - 2³ = 55575749 is a prime.

It is a super-2 number, since 2×55575757² = 6177329532246098, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55575857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27787878 + 27787879.

It is an arithmetic number, because the mean of its divisors is an integer number (27787879).

Almost surely, 2^55575757 is an apocalyptic number.

It is an amenable number.

55575757 is a deficient number, since it is larger than the sum of its proper divisors (1).

55575757 is an equidigital number, since it uses as much as digits as its factorization.

55575757 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1071875, while the sum is 46.

The square root of 55575757 is about 7454.9149559200. The cubic root of 55575757 is about 381.6176583421.

The spelling of 55575757 in words is "fifty-five million, five hundred seventy-five thousand, seven hundred fifty-seven".