145651661 has 2 divisors, whose sum is σ = 145651662. Its totient is φ = 145651660.

The previous prime is 145651643. The next prime is 145651669. The reversal of 145651661 is 166156541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 135373225 + 10278436 = 11635^2 + 3206^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145651661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145651669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72825830 + 72825831.

It is an arithmetic number, because the mean of its divisors is an integer number (72825831).

Almost surely, 2^145651661 is an apocalyptic number.

It is an amenable number.

145651661 is a deficient number, since it is larger than the sum of its proper divisors (1).

145651661 is an equidigital number, since it uses as much as digits as its factorization.

145651661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21600, while the sum is 35.

The square root of 145651661 is about 12068.6229951888. The cubic root of 145651661 is about 526.1446360675.

The spelling of 145651661 in words is "one hundred forty-five million, six hundred fifty-one thousand, six hundred sixty-one".