55142643 has 4 divisors (see below), whose sum is σ = 73523528. Its totient is φ = 36761760.

The previous prime is 55142629. The next prime is 55142651. The reversal of 55142643 is 34624155.

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

It is not a de Polignac number, because 55142643 - 2⁸ = 55142387 is a prime.

It is a super-2 number, since 2×55142643² = 6081422154050898, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55142643.

It is not an unprimeable number, because it can be changed into a prime (55142743) 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, 9190438 + ... + 9190443.

It is an arithmetic number, because the mean of its divisors is an integer number (18380882).

Almost surely, 2^55142643 is an apocalyptic number.

55142643 is a deficient number, since it is larger than the sum of its proper divisors (18380885).

55142643 is a wasteful number, since it uses less digits than its factorization.

55142643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18380884.

The product of its digits is 14400, while the sum is 30.

The square root of 55142643 is about 7425.8092488294. The cubic root of 55142643 is about 380.6237286580.

Adding to 55142643 its reverse (34624155), we get a palindrome (89766798).

The spelling of 55142643 in words is "fifty-five million, one hundred forty-two thousand, six hundred forty-three".