1816169660501 has 6 divisors (see below), whose sum is σ = 2112687156150. Its totient is φ = 1556716851816.

The previous prime is 1816169660413. The next prime is 1816169660533. The reversal of 1816169660501 is 1050669616181.

It can be written as a sum of positive squares in only one way, i.e., 1400847413476 + 415322247025 = 1183574^2 + 644455^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1816169660501 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1816169660501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1816169660581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18532343426 + ... + 18532343523.

It is an arithmetic number, because the mean of its divisors is an integer number (352114526025).

Almost surely, 2^{1816169660501} is an apocalyptic number.

It is an amenable number.

1816169660501 is a deficient number, since it is larger than the sum of its proper divisors (296517495649).

1816169660501 is an equidigital number, since it uses as much as digits as its factorization.

1816169660501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37064686963 (or 37064686956 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 50.

The spelling of 1816169660501 in words is "one trillion, eight hundred sixteen billion, one hundred sixty-nine million, six hundred sixty thousand, five hundred one".