55442555 has 16 divisors (see below), whose sum is σ = 76158144. Its totient is φ = 37956480.

The previous prime is 55442507. The next prime is 55442557. The reversal of 55442555 is 55524455.

It is not a de Polignac number, because 55442555 - 2¹⁰ = 55441531 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55442557) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36389 + ... + 37881.

It is an arithmetic number, because the mean of its divisors is an integer number (4759884).

Almost surely, 2^55442555 is an apocalyptic number.

55442555 is a deficient number, since it is larger than the sum of its proper divisors (20715589).

55442555 is a wasteful number, since it uses less digits than its factorization.

55442555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2566.

The product of its digits is 100000, while the sum is 35.

The square root of 55442555 is about 7445.9757587572. The cubic root of 55442555 is about 381.3125318912.

The spelling of 55442555 in words is "fifty-five million, four hundred forty-two thousand, five hundred fifty-five".