666554144 has 24 divisors (see below), whose sum is σ = 1315422108. Its totient is φ = 332478720.

The previous prime is 666554111. The next prime is 666554209. The reversal of 666554144 is 441455666.

It can be written as a sum of positive squares in 2 ways, for example, as 511302544 + 155251600 = 22612^2 + 12460^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11267 + ... + 38210.

Almost surely, 2^666554144 is an apocalyptic number.

It is an amenable number.

666554144 is a deficient number, since it is larger than the sum of its proper divisors (648867964).

666554144 is a wasteful number, since it uses less digits than its factorization.

666554144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49908 (or 49900 counting only the distinct ones).

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

The square root of 666554144 is about 25817.7098906932. The cubic root of 666554144 is about 873.5313131691.

The spelling of 666554144 in words is "six hundred sixty-six million, five hundred fifty-four thousand, one hundred forty-four".