55705551 has 8 divisors (see below), whose sum is σ = 81026304. Its totient is φ = 33760920.

The previous prime is 55705547. The next prime is 55705553. The reversal of 55705551 is 15550755.

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

It is not a de Polignac number, because 55705551 - 2² = 55705547 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 1688047 = 55705551 / (5 + 5 + 7 + 0 + 5 + 5 + 5 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55705553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 843991 + ... + 844056.

It is an arithmetic number, because the mean of its divisors is an integer number (10128288).

Almost surely, 2^55705551 is an apocalyptic number.

55705551 is a deficient number, since it is larger than the sum of its proper divisors (25320753).

55705551 is a wasteful number, since it uses less digits than its factorization.

55705551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1688061.

The product of its (nonzero) digits is 21875, while the sum is 33.

The square root of 55705551 is about 7463.6151428112. The cubic root of 55705551 is about 381.9145094363.

The spelling of 55705551 in words is "fifty-five million, seven hundred five thousand, five hundred fifty-one".