666139248 has 80 divisors (see below), whose sum is σ = 1995229440. Its totient is φ = 212389056.

The previous prime is 666139241. The next prime is 666139249. The reversal of 666139248 is 842931666.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666139241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23586 + ... + 43457.

It is an arithmetic number, because the mean of its divisors is an integer number (24940368).

Almost surely, 2^666139248 is an apocalyptic number.

It is an amenable number.

666139248 is an abundant number, since it is smaller than the sum of its proper divisors (1329090192).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666139248 is a wasteful number, since it uses less digits than its factorization.

666139248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67083 (or 67071 counting only the distinct ones).

The product of its digits is 373248, while the sum is 45.

The square root of 666139248 is about 25809.6735353239. The cubic root of 666139248 is about 873.3500326365.

The spelling of 666139248 in words is "six hundred sixty-six million, one hundred thirty-nine thousand, two hundred forty-eight".