1660942813 has 2 divisors, whose sum is σ = 1660942814. Its totient is φ = 1660942812.

The previous prime is 1660942799. The next prime is 1660942853. The reversal of 1660942813 is 3182490661.

It is an a-pointer prime, because the next prime (1660942853) can be obtained adding 1660942813 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1399732569 + 261210244 = 37413^2 + 16162^2 .

It is a cyclic number.

It is not a de Polignac number, because 1660942813 - 2¹³ = 1660934621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1660942853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830471406 + 830471407.

It is an arithmetic number, because the mean of its divisors is an integer number (830471407).

Almost surely, 2^1660942813 is an apocalyptic number.

It is an amenable number.

1660942813 is a deficient number, since it is larger than the sum of its proper divisors (1).

1660942813 is an equidigital number, since it uses as much as digits as its factorization.

1660942813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 1660942813 is about 40754.6661500251. Note that the first 3 decimals coincide. The cubic root of 1660942813 is about 1184.2722689702.

The spelling of 1660942813 in words is "one billion, six hundred sixty million, nine hundred forty-two thousand, eight hundred thirteen".