1816570544749 has 2 divisors, whose sum is σ = 1816570544750. Its totient is φ = 1816570544748.

The previous prime is 1816570544743. The next prime is 1816570544771. The reversal of 1816570544749 is 9474450756181.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1816276422249 + 294122500 = 1347693^2 + 17150^2 .

It is a cyclic number.

It is not a de Polignac number, because 1816570544749 - 2¹¹ = 1816570542701 is a prime.

It is a super-2 number, since 2×1816570544749² (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 (1816570544743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 908285272374 + 908285272375.

It is an arithmetic number, because the mean of its divisors is an integer number (908285272375).

Almost surely, 2^{1816570544749} is an apocalyptic number.

It is an amenable number.

1816570544749 is a deficient number, since it is larger than the sum of its proper divisors (1).

1816570544749 is an equidigital number, since it uses as much as digits as its factorization.

1816570544749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 33868800, while the sum is 61.

The spelling of 1816570544749 in words is "one trillion, eight hundred sixteen billion, five hundred seventy million, five hundred forty-four thousand, seven hundred forty-nine".