655390145 has 8 divisors (see below), whose sum is σ = 787171560. Its totient is φ = 523843200.

The previous prime is 655390097. The next prime is 655390147. The reversal of 655390145 is 541093556.

It can be written as a sum of positive squares in 4 ways, for example, as 41886784 + 613503361 = 6472^2 + 24769^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 655390145 - 2⁶ = 655390081 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 655390099 and 655390108.

It is not an unprimeable number, because it can be changed into a prime (655390147) 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 7 ways as a sum of consecutive naturals, for example, 52406 + ... + 63695.

It is an arithmetic number, because the mean of its divisors is an integer number (98396445).

Almost surely, 2^655390145 is an apocalyptic number.

It is an amenable number.

655390145 is a deficient number, since it is larger than the sum of its proper divisors (131781415).

655390145 is a wasteful number, since it uses less digits than its factorization.

655390145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117235.

The product of its (nonzero) digits is 81000, while the sum is 38.

The square root of 655390145 is about 25600.5887627609. The cubic root of 655390145 is about 868.6269551594.

The spelling of 655390145 in words is "six hundred fifty-five million, three hundred ninety thousand, one hundred forty-five".