55051557 has 8 divisors (see below), whose sum is σ = 80075040. Its totient is φ = 33364560.

The previous prime is 55051537. The next prime is 55051583. The reversal of 55051557 is 75515055.

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

It is not a de Polignac number, because 55051557 - 2¹¹ = 55049509 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: 1668229 = 55051557 / (5 + 5 + 0 + 5 + 1 + 5 + 5 + 7).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55051537) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 834082 + ... + 834147.

It is an arithmetic number, because the mean of its divisors is an integer number (10009380).

Almost surely, 2^55051557 is an apocalyptic number.

It is an amenable number.

55051557 is a deficient number, since it is larger than the sum of its proper divisors (25023483).

55051557 is a wasteful number, since it uses less digits than its factorization.

55051557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1668243.

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

The square root of 55051557 is about 7419.6736451140. The cubic root of 55051557 is about 380.4140385531.

The spelling of 55051557 in words is "fifty-five million, fifty-one thousand, five hundred fifty-seven".