55450021605919 has 2 divisors, whose sum is σ = 55450021605920. Its totient is φ = 55450021605918.

The previous prime is 55450021605899. The next prime is 55450021605967. The reversal of 55450021605919 is 91950612005455.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55450021605919 - 2²³ = 55450013217311 is a prime.

It is a super-2 number, since 2×55450021605919² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55450021605989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27725010802959 + 27725010802960.

It is an arithmetic number, because the mean of its divisors is an integer number (27725010802960).

Almost surely, 2^{55450021605919} is an apocalyptic number.

55450021605919 is a deficient number, since it is larger than the sum of its proper divisors (1).

55450021605919 is an equidigital number, since it uses as much as digits as its factorization.

55450021605919 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2430000, while the sum is 52.

The spelling of 55450021605919 in words is "fifty-five trillion, four hundred fifty billion, twenty-one million, six hundred five thousand, nine hundred nineteen".