1985541465599 has 2 divisors, whose sum is σ = 1985541465600. Its totient is φ = 1985541465598.

The previous prime is 1985541465547. The next prime is 1985541465629. The reversal of 1985541465599 is 9955641455891.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1985541465599 is a prime.

It is a super-2 number, since 2×1985541465599² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1985541465199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 992770732799 + 992770732800.

It is an arithmetic number, because the mean of its divisors is an integer number (992770732800).

Almost surely, 2^{1985541465599} is an apocalyptic number.

1985541465599 is a deficient number, since it is larger than the sum of its proper divisors (1).

1985541465599 is an equidigital number, since it uses as much as digits as its factorization.

1985541465599 is an evil number, because the sum of its binary digits is even.

The product of its digits is 349920000, while the sum is 71.

The spelling of 1985541465599 in words is "one trillion, nine hundred eighty-five billion, five hundred forty-one million, four hundred sixty-five thousand, five hundred ninety-nine".