1665551093 has 2 divisors, whose sum is σ = 1665551094. Its totient is φ = 1665551092.

The previous prime is 1665551089. The next prime is 1665551117. The reversal of 1665551093 is 3901555661.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1656652804 + 8898289 = 40702^2 + 2983^2 .

It is a cyclic number.

It is not a de Polignac number, because 1665551093 - 2² = 1665551089 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1665551093.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1665551053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832775546 + 832775547.

It is an arithmetic number, because the mean of its divisors is an integer number (832775547).

Almost surely, 2^1665551093 is an apocalyptic number.

It is an amenable number.

1665551093 is a deficient number, since it is larger than the sum of its proper divisors (1).

1665551093 is an equidigital number, since it uses as much as digits as its factorization.

1665551093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 121500, while the sum is 41.

The square root of 1665551093 is about 40811.1638280508. The cubic root of 1665551093 is about 1185.3665106868.

The spelling of 1665551093 in words is "one billion, six hundred sixty-five million, five hundred fifty-one thousand, ninety-three".