55120051442 has 4 divisors (see below), whose sum is σ = 82680077166. Its totient is φ = 27560025720.

The previous prime is 55120051421. The next prime is 55120051447. The reversal of 55120051442 is 24415002155.

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

It can be written as a sum of positive squares in only one way, i.e., 52225503841 + 2894547601 = 228529^2 + 53801^2 .

It is not an unprimeable number, because it can be changed into a prime (55120051447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13780012859 + ... + 13780012862.

Almost surely, 2^55120051442 is an apocalyptic number.

55120051442 is a deficient number, since it is larger than the sum of its proper divisors (27560025724).

55120051442 is a wasteful number, since it uses less digits than its factorization.

55120051442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27560025723.

The product of its (nonzero) digits is 8000, while the sum is 29.

Adding to 55120051442 its reverse (24415002155), we get a palindrome (79535053597).

The spelling of 55120051442 in words is "fifty-five billion, one hundred twenty million, fifty-one thousand, four hundred forty-two".