1660651253 has 2 divisors, whose sum is σ = 1660651254. Its totient is φ = 1660651252.

The previous prime is 1660651247. The next prime is 1660651283. The reversal of 1660651253 is 3521560661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1653479569 + 7171684 = 40663^2 + 2678^2 .

It is a cyclic number.

It is not a de Polignac number, because 1660651253 - 2¹⁴ = 1660634869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1660651283) 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 as a sum of consecutive naturals, namely, 830325626 + 830325627.

It is an arithmetic number, because the mean of its divisors is an integer number (830325627).

Almost surely, 2^1660651253 is an apocalyptic number.

It is an amenable number.

1660651253 is a deficient number, since it is larger than the sum of its proper divisors (1).

1660651253 is an equidigital number, since it uses as much as digits as its factorization.

1660651253 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 1660651253 is about 40751.0889793144. The cubic root of 1660651253 is about 1184.2029696491.

The spelling of 1660651253 in words is "one billion, six hundred sixty million, six hundred fifty-one thousand, two hundred fifty-three".