1864908221573 has 2 divisors, whose sum is σ = 1864908221574. Its totient is φ = 1864908221572.

The previous prime is 1864908221543. The next prime is 1864908221593. The reversal of 1864908221573 is 3751228094681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1851607904644 + 13300316929 = 1360738^2 + 115327^2 .

It is a cyclic number.

It is not a de Polignac number, because 1864908221573 - 2¹⁸ = 1864907959429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1864908221543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 932454110786 + 932454110787.

It is an arithmetic number, because the mean of its divisors is an integer number (932454110787).

It is a 1-persistent number, because it is pandigital, but 2⋅1864908221573 = 3729816443146 is not.

Almost surely, 2^{1864908221573} is an apocalyptic number.

It is an amenable number.

1864908221573 is a deficient number, since it is larger than the sum of its proper divisors (1).

1864908221573 is an equidigital number, since it uses as much as digits as its factorization.

1864908221573 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5806080, while the sum is 56.

The spelling of 1864908221573 in words is "one trillion, eight hundred sixty-four billion, nine hundred eight million, two hundred twenty-one thousand, five hundred seventy-three".