1660541977 has 2 divisors, whose sum is σ = 1660541978. Its totient is φ = 1660541976.

The previous prime is 1660541969. The next prime is 1660542011. The reversal of 1660541977 is 7791450661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1335244681 + 325297296 = 36541^2 + 18036^2 .

It is a cyclic number.

It is not a de Polignac number, because 1660541977 - 2³ = 1660541969 is a prime.

It is a super-3 number, since 3×1660541977³ (a number of 29 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1660571977) 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, 830270988 + 830270989.

It is an arithmetic number, because the mean of its divisors is an integer number (830270989).

Almost surely, 2^1660541977 is an apocalyptic number.

It is an amenable number.

1660541977 is a deficient number, since it is larger than the sum of its proper divisors (1).

1660541977 is an equidigital number, since it uses as much as digits as its factorization.

1660541977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 317520, while the sum is 46.

The square root of 1660541977 is about 40749.7481832710. The cubic root of 1660541977 is about 1184.1769943373.

The spelling of 1660541977 in words is "one billion, six hundred sixty million, five hundred forty-one thousand, nine hundred seventy-seven".