55420020501 has 4 divisors (see below), whose sum is σ = 73893360672. Its totient is φ = 36946680332.

The previous prime is 55420020473. The next prime is 55420020503. The reversal of 55420020501 is 10502002455.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55420020501 - 2¹⁸ = 55419758357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55420020503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9236670081 + ... + 9236670086.

It is an arithmetic number, because the mean of its divisors is an integer number (18473340168).

Almost surely, 2^55420020501 is an apocalyptic number.

It is an amenable number.

55420020501 is a deficient number, since it is larger than the sum of its proper divisors (18473340171).

55420020501 is a wasteful number, since it uses less digits than its factorization.

55420020501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18473340170.

The product of its (nonzero) digits is 2000, while the sum is 24.

Adding to 55420020501 its reverse (10502002455), we get a palindrome (65922022956).

The spelling of 55420020501 in words is "fifty-five billion, four hundred twenty million, twenty thousand, five hundred one".