1660155061 has 2 divisors, whose sum is σ = 1660155062. Its totient is φ = 1660155060.

The previous prime is 1660155047. The next prime is 1660155143. The reversal of 1660155061 is 1605510661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1660155025 + 36 = 40745^2 + 6^2 .

It is a cyclic number.

It is not a de Polignac number, because 1660155061 - 2¹⁵ = 1660122293 is a prime.

It is a super-2 number, since 2×1660155061² = 5512229653127827442, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1660155031) 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, 830077530 + 830077531.

It is an arithmetic number, because the mean of its divisors is an integer number (830077531).

Almost surely, 2^1660155061 is an apocalyptic number.

It is an amenable number.

1660155061 is a deficient number, since it is larger than the sum of its proper divisors (1).

1660155061 is an equidigital number, since it uses as much as digits as its factorization.

1660155061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 1660155061 is about 40745.0004417720. Note that the first 3 decimals coincide. The cubic root of 1660155061 is about 1184.0850138026.

The spelling of 1660155061 in words is "one billion, six hundred sixty million, one hundred fifty-five thousand, sixty-one".