55557761 has 4 divisors (see below), whose sum is σ = 63494592. Its totient is φ = 47620932.

The previous prime is 55557731. The next prime is 55557787. The reversal of 55557761 is 16775555.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55557761 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (55557721) 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, 3968405 + ... + 3968418.

It is an arithmetic number, because the mean of its divisors is an integer number (15873648).

Almost surely, 2^55557761 is an apocalyptic number.

It is an amenable number.

55557761 is a deficient number, since it is larger than the sum of its proper divisors (7936831).

55557761 is an equidigital number, since it uses as much as digits as its factorization.

55557761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7936830.

The product of its digits is 183750, while the sum is 41.

The square root of 55557761 is about 7453.7078692420. The cubic root of 55557761 is about 381.5764633250.

The spelling of 55557761 in words is "fifty-five million, five hundred fifty-seven thousand, seven hundred sixty-one".