55145554 has 4 divisors (see below), whose sum is σ = 82718334. Its totient is φ = 27572776.

The previous prime is 55145551. The next prime is 55145591. The reversal of 55145554 is 45554155.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45554155 = 5 ⋅9110831.

It can be written as a sum of positive squares in only one way, i.e., 45873529 + 9272025 = 6773^2 + 3045^2 .

It is not an unprimeable number, because it can be changed into a prime (55145551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13786387 + ... + 13786390.

Almost surely, 2^55145554 is an apocalyptic number.

55145554 is a deficient number, since it is larger than the sum of its proper divisors (27572780).

55145554 is a wasteful number, since it uses less digits than its factorization.

55145554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27572779.

The product of its digits is 50000, while the sum is 34.

The square root of 55145554 is about 7426.0052518161. The cubic root of 55145554 is about 380.6304262948.

The spelling of 55145554 in words is "fifty-five million, one hundred forty-five thousand, five hundred fifty-four".