145636661 has 2 divisors, whose sum is σ = 145636662. Its totient is φ = 145636660.

The previous prime is 145636651. The next prime is 145636669. The reversal of 145636661 is 166636541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133864900 + 11771761 = 11570^2 + 3431^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145636661 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145636669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72818330 + 72818331.

It is an arithmetic number, because the mean of its divisors is an integer number (72818331).

Almost surely, 2^145636661 is an apocalyptic number.

It is an amenable number.

145636661 is a deficient number, since it is larger than the sum of its proper divisors (1).

145636661 is an equidigital number, since it uses as much as digits as its factorization.

145636661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 38.

The square root of 145636661 is about 12068.0015329797. The cubic root of 145636661 is about 526.1265737023.

The spelling of 145636661 in words is "one hundred forty-five million, six hundred thirty-six thousand, six hundred sixty-one".