1854540039817 has 2 divisors, whose sum is σ = 1854540039818. Its totient is φ = 1854540039816.

The previous prime is 1854540039731. The next prime is 1854540039839. The reversal of 1854540039817 is 7189300454581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1835255440656 + 19284599161 = 1354716^2 + 138869^2 .

It is a cyclic number.

It is not a de Polignac number, because 1854540039817 - 2³¹ = 1852392556169 is a prime.

It is not a weakly prime, because it can be changed into another prime (1854540039857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 927270019908 + 927270019909.

It is an arithmetic number, because the mean of its divisors is an integer number (927270019909).

Almost surely, 2^{1854540039817} is an apocalyptic number.

It is an amenable number.

1854540039817 is a deficient number, since it is larger than the sum of its proper divisors (1).

1854540039817 is an equidigital number, since it uses as much as digits as its factorization.

1854540039817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4838400, while the sum is 55.

The spelling of 1854540039817 in words is "one trillion, eight hundred fifty-four billion, five hundred forty million, thirty-nine thousand, eight hundred seventeen".