666498660 has 48 divisors (see below), whose sum is σ = 1873501056. Its totient is φ = 177037312.

The previous prime is 666498659. The next prime is 666498671. The reversal of 666498660 is 66894666.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6192 + ... + 37031.

It is an arithmetic number, because the mean of its divisors is an integer number (39031272).

Almost surely, 2^666498660 is an apocalyptic number.

666498660 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

666498660 is an abundant number, since it is smaller than the sum of its proper divisors (1207002396).

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

666498660 is a wasteful number, since it uses less digits than its factorization.

666498660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43492 (or 43490 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 51.

The square root of 666498660 is about 25816.6353346055. The cubic root of 666498660 is about 873.5070749000.

The spelling of 666498660 in words is "six hundred sixty-six million, four hundred ninety-eight thousand, six hundred sixty".