1660934521 has 2 divisors, whose sum is σ = 1660934522. Its totient is φ = 1660934520.

The previous prime is 1660934503. The next prime is 1660934531. The reversal of 1660934521 is 1254390661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1653316921 + 7617600 = 40661^2 + 2760^2 .

It is a cyclic number.

It is not a de Polignac number, because 1660934521 - 2¹³ = 1660926329 is a prime.

It is not a weakly prime, because it can be changed into another prime (1660934501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830467260 + 830467261.

It is an arithmetic number, because the mean of its divisors is an integer number (830467261).

Almost surely, 2^1660934521 is an apocalyptic number.

It is an amenable number.

1660934521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1660934521 is an equidigital number, since it uses as much as digits as its factorization.

1660934521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 1660934521 is about 40754.5644192157. The cubic root of 1660934521 is about 1184.2702982016.

The spelling of 1660934521 in words is "one billion, six hundred sixty million, nine hundred thirty-four thousand, five hundred twenty-one".