55505553 has 4 divisors (see below), whose sum is σ = 74007408. Its totient is φ = 37003700.

The previous prime is 55505539. The next prime is 55505557. The reversal of 55505553 is 35550555.

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 not a de Polignac number, because 55505553 - 2⁵ = 55505521 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55505557) 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, 9250923 + ... + 9250928.

It is an arithmetic number, because the mean of its divisors is an integer number (18501852).

Almost surely, 2^55505553 is an apocalyptic number.

It is an amenable number.

55505553 is a deficient number, since it is larger than the sum of its proper divisors (18501855).

55505553 is a wasteful number, since it uses less digits than its factorization.

55505553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18501854.

The product of its (nonzero) digits is 46875, while the sum is 33.

The square root of 55505553 is about 7450.2048965112. The cubic root of 55505553 is about 381.4569025473.

The spelling of 55505553 in words is "fifty-five million, five hundred five thousand, five hundred fifty-three".