1985541465629 has 2 divisors, whose sum is σ = 1985541465630. Its totient is φ = 1985541465628.

The previous prime is 1985541465599. The next prime is 1985541465637. The reversal of 1985541465629 is 9265641455891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1863492549604 + 122048916025 = 1365098^2 + 349355^2 .

It is a cyclic number.

It is not a de Polignac number, because 1985541465629 - 2²⁰ = 1985540417053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1985541465659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 992770732814 + 992770732815.

It is an arithmetic number, because the mean of its divisors is an integer number (992770732815).

Almost surely, 2^{1985541465629} is an apocalyptic number.

It is an amenable number.

1985541465629 is a deficient number, since it is larger than the sum of its proper divisors (1).

1985541465629 is an equidigital number, since it uses as much as digits as its factorization.

1985541465629 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312000, while the sum is 65.

The spelling of 1985541465629 in words is "one trillion, nine hundred eighty-five billion, five hundred forty-one million, four hundred sixty-five thousand, six hundred twenty-nine".