1660002061 has 2 divisors, whose sum is σ = 1660002062. Its totient is φ = 1660002060.

The previous prime is 1660002037. The next prime is 1660002083. The reversal of 1660002061 is 1602000661.

It is an a-pointer prime, because the next prime (1660002083) can be obtained adding 1660002061 to its sum of digits (22).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1265224900 + 394777161 = 35570^2 + 19869^2 .

It is a cyclic number.

It is not a de Polignac number, because 1660002061 - 2⁷ = 1660001933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1660002661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830001030 + 830001031.

It is an arithmetic number, because the mean of its divisors is an integer number (830001031).

Almost surely, 2^1660002061 is an apocalyptic number.

It is an amenable number.

1660002061 is a deficient number, since it is larger than the sum of its proper divisors (1).

1660002061 is an equidigital number, since it uses as much as digits as its factorization.

1660002061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 1660002061 is about 40743.1228675466. The cubic root of 1660002061 is about 1184.0486375674.

The spelling of 1660002061 in words is "one billion, six hundred sixty million, two thousand, sixty-one".