665146544 has 20 divisors (see below), whose sum is σ = 1297260720. Its totient is φ = 330369600.

The previous prime is 665146543. The next prime is 665146609. The reversal of 665146544 is 445641566.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (665146543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135239 + ... + 140070.

It is an arithmetic number, because the mean of its divisors is an integer number (64863036).

Almost surely, 2^665146544 is an apocalyptic number.

It is an amenable number.

665146544 is a deficient number, since it is larger than the sum of its proper divisors (632114176).

665146544 is a wasteful number, since it uses less digits than its factorization.

665146544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275468 (or 275462 counting only the distinct ones).

The product of its digits is 345600, while the sum is 41.

The square root of 665146544 is about 25790.4351262246. The cubic root of 665146544 is about 872.9159847017.

The spelling of 665146544 in words is "six hundred sixty-five million, one hundred forty-six thousand, five hundred forty-four".