1660121237 has 2 divisors, whose sum is σ = 1660121238. Its totient is φ = 1660121236.

The previous prime is 1660121159. The next prime is 1660121249. The reversal of 1660121237 is 7321210661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1657385521 + 2735716 = 40711^2 + 1654^2 .

It is a cyclic number.

It is not a de Polignac number, because 1660121237 - 2¹⁶ = 1660055701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1660121537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830060618 + 830060619.

It is an arithmetic number, because the mean of its divisors is an integer number (830060619).

Almost surely, 2^1660121237 is an apocalyptic number.

It is an amenable number.

1660121237 is a deficient number, since it is larger than the sum of its proper divisors (1).

1660121237 is an equidigital number, since it uses as much as digits as its factorization.

1660121237 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 1660121237 is about 40744.5853703287. The cubic root of 1660121237 is about 1184.0769722318.

Adding to 1660121237 its reverse (7321210661), we get a palindrome (8981331898).

The spelling of 1660121237 in words is "one billion, six hundred sixty million, one hundred twenty-one thousand, two hundred thirty-seven".