145668553 has 2 divisors, whose sum is σ = 145668554. Its totient is φ = 145668552.

The previous prime is 145668533. The next prime is 145668559. The reversal of 145668553 is 355866541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 142754704 + 2913849 = 11948^2 + 1707^2 .

It is an emirp because it is prime and its reverse (355866541) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 145668553 - 2⁵ = 145668521 is a prime.

It is a super-2 number, since 2×145668553² = 42438654666227618, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (145668559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72834276 + 72834277.

It is an arithmetic number, because the mean of its divisors is an integer number (72834277).

Almost surely, 2^145668553 is an apocalyptic number.

It is an amenable number.

145668553 is a deficient number, since it is larger than the sum of its proper divisors (1).

145668553 is an equidigital number, since it uses as much as digits as its factorization.

145668553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432000, while the sum is 43.

The square root of 145668553 is about 12069.3228061893. The cubic root of 145668553 is about 526.1649752145.

The spelling of 145668553 in words is "one hundred forty-five million, six hundred sixty-eight thousand, five hundred fifty-three".