1665015481 has 2 divisors, whose sum is σ = 1665015482. Its totient is φ = 1665015480.

The previous prime is 1665015449. The next prime is 1665015587. The reversal of 1665015481 is 1845105661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1473331456 + 191684025 = 38384^2 + 13845^2 .

It is a cyclic number.

It is not a de Polignac number, because 1665015481 - 2⁵ = 1665015449 is a prime.

It is a super-2 number, since 2×1665015481² = 5544553103939322722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1665015481.

It is not a weakly prime, because it can be changed into another prime (1665015431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832507740 + 832507741.

It is an arithmetic number, because the mean of its divisors is an integer number (832507741).

Almost surely, 2^1665015481 is an apocalyptic number.

It is an amenable number.

1665015481 is a deficient number, since it is larger than the sum of its proper divisors (1).

1665015481 is an equidigital number, since it uses as much as digits as its factorization.

1665015481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28800, while the sum is 37.

The square root of 1665015481 is about 40804.6012233915. The cubic root of 1665015481 is about 1185.2394327085.

It can be divided in two parts, 16650 and 15481, that added together give a triangular number (32131 = T₂₅₃).

The spelling of 1665015481 in words is "one billion, six hundred sixty-five million, fifteen thousand, four hundred eighty-one".