145663649 has 2 divisors, whose sum is σ = 145663650. Its totient is φ = 145663648.

The previous prime is 145663643. The next prime is 145663657. The reversal of 145663649 is 946366541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84511249 + 61152400 = 9193^2 + 7820^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145663649 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (145663643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72831824 + 72831825.

It is an arithmetic number, because the mean of its divisors is an integer number (72831825).

Almost surely, 2^145663649 is an apocalyptic number.

It is an amenable number.

145663649 is a deficient number, since it is larger than the sum of its proper divisors (1).

145663649 is an equidigital number, since it uses as much as digits as its factorization.

145663649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 466560, while the sum is 44.

The square root of 145663649 is about 12069.1196447794. The cubic root of 145663649 is about 526.1590706182.

The spelling of 145663649 in words is "one hundred forty-five million, six hundred sixty-three thousand, six hundred forty-nine".