55420213493 has 4 divisors (see below), whose sum is σ = 55453460640. Its totient is φ = 55386966348.

The previous prime is 55420213481. The next prime is 55420213501. The reversal of 55420213493 is 39431202455.

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 55420213493 - 2¹⁴ = 55420197109 is a prime.

It is a super-2 number, since 2×55420213493² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55420213423) 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, 16621073 + ... + 16624406.

It is an arithmetic number, because the mean of its divisors is an integer number (13863365160).

Almost surely, 2^55420213493 is an apocalyptic number.

It is an amenable number.

55420213493 is a deficient number, since it is larger than the sum of its proper divisors (33247147).

55420213493 is a wasteful number, since it uses less digits than its factorization.

55420213493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33247146.

The product of its (nonzero) digits is 129600, while the sum is 38.

The spelling of 55420213493 in words is "fifty-five billion, four hundred twenty million, two hundred thirteen thousand, four hundred ninety-three".