145165553 has 4 divisors (see below), whose sum is σ = 156332148. Its totient is φ = 133998960.

The previous prime is 145165523. The next prime is 145165571. The reversal of 145165553 is 355561541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 355561541 = 79 ⋅4500779.

It can be written as a sum of positive squares in 2 ways, for example, as 23107249 + 122058304 = 4807^2 + 11048^2 .

It is a cyclic number.

It is not a de Polignac number, because 145165553 - 2²⁰ = 144116977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145165513) 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 in 3 ways as a sum of consecutive naturals, for example, 5583278 + ... + 5583303.

It is an arithmetic number, because the mean of its divisors is an integer number (39083037).

Almost surely, 2^145165553 is an apocalyptic number.

145165553 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

145165553 is a deficient number, since it is larger than the sum of its proper divisors (11166595).

145165553 is a wasteful number, since it uses less digits than its factorization.

145165553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11166594.

The product of its digits is 45000, while the sum is 35.

The square root of 145165553 is about 12048.4668319251. The cubic root of 145165553 is about 525.5586530960.

The spelling of 145165553 in words is "one hundred forty-five million, one hundred sixty-five thousand, five hundred fifty-three".