55420440423 has 8 divisors (see below), whose sum is σ = 73895487600. Its totient is φ = 36946176768.

The previous prime is 55420440391. The next prime is 55420440431. The reversal of 55420440423 is 32404402455.

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

It is not a de Polignac number, because 55420440423 - 2⁵ = 55420440391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55420440443) 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, 3978 + ... + 332951.

It is an arithmetic number, because the mean of its divisors is an integer number (9236935950).

Almost surely, 2^55420440423 is an apocalyptic number.

55420440423 is a deficient number, since it is larger than the sum of its proper divisors (18475047177).

55420440423 is a wasteful number, since it uses less digits than its factorization.

55420440423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391761.

The product of its (nonzero) digits is 76800, while the sum is 33.

Adding to 55420440423 its reverse (32404402455), we get a palindrome (87824842878).

The spelling of 55420440423 in words is "fifty-five billion, four hundred twenty million, four hundred forty thousand, four hundred twenty-three".