55505761 has 4 divisors (see below), whose sum is σ = 55645972. Its totient is φ = 55365552.

The previous prime is 55505753. The next prime is 55505767. The reversal of 55505761 is 16750555.

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 29495761 + 26010000 = 5431^2 + 5100^2 .

It is a cyclic number.

It is not a de Polignac number, because 55505761 - 2³ = 55505753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55505767) 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, 69510 + ... + 70303.

It is an arithmetic number, because the mean of its divisors is an integer number (13911493).

Almost surely, 2^55505761 is an apocalyptic number.

It is an amenable number.

55505761 is a deficient number, since it is larger than the sum of its proper divisors (140211).

55505761 is a wasteful number, since it uses less digits than its factorization.

55505761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140210.

The product of its (nonzero) digits is 26250, while the sum is 34.

The square root of 55505761 is about 7450.2188558458. The cubic root of 55505761 is about 381.4573790338.

It can be divided in two parts, 5550 and 5761, that added together give a palindrome (11311).

The spelling of 55505761 in words is "fifty-five million, five hundred five thousand, seven hundred sixty-one".