1660553 has 2 divisors, whose sum is σ = 1660554. Its totient is φ = 1660552.

The previous prime is 1660517. The next prime is 1660559. The reversal of 1660553 is 3550661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1261129 + 399424 = 1123^2 + 632^2 .

It is a cyclic number.

It is not a de Polignac number, because 1660553 - 2⁶ = 1660489 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1660559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830276 + 830277.

It is an arithmetic number, because the mean of its divisors is an integer number (830277).

2^1660553 is an apocalyptic number.

It is an amenable number.

1660553 is a deficient number, since it is larger than the sum of its proper divisors (1).

1660553 is an equidigital number, since it uses as much as digits as its factorization.

1660553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2700, while the sum is 26.

The square root of 1660553 is about 1288.6244604228. The cubic root of 1660553 is about 118.4179614597.

The spelling of 1660553 in words is "one million, six hundred sixty thousand, five hundred fifty-three".