55552551 has 4 divisors (see below), whose sum is σ = 74070072. Its totient is φ = 37035032.

The previous prime is 55552547. The next prime is 55552573. The reversal of 55552551 is 15525555.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55552551 - 2² = 55552547 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55552531) 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, 9258756 + ... + 9258761.

It is an arithmetic number, because the mean of its divisors is an integer number (18517518).

Almost surely, 2^55552551 is an apocalyptic number.

55552551 is a deficient number, since it is larger than the sum of its proper divisors (18517521).

55552551 is a wasteful number, since it uses less digits than its factorization.

55552551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18517520.

The product of its digits is 31250, while the sum is 33.

The square root of 55552551 is about 7453.3583705602. The cubic root of 55552551 is about 381.5645353454.

The spelling of 55552551 in words is "fifty-five million, five hundred fifty-two thousand, five hundred fifty-one".