666740140 has 48 divisors (see below), whose sum is σ = 1530464544. Its totient is φ = 241971200.

The previous prime is 666740117. The next prime is 666740161. The reversal of 666740140 is 41047666.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 666740096 and 666740105.

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, 119820 + ... + 125260.

It is an arithmetic number, because the mean of its divisors is an integer number (31884678).

Almost surely, 2^666740140 is an apocalyptic number.

It is an amenable number.

666740140 is an abundant number, since it is smaller than the sum of its proper divisors (863724404).

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

666740140 is a wasteful number, since it uses less digits than its factorization.

666740140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6018 (or 6016 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 666740140 is about 25821.3117404984. The cubic root of 666740140 is about 873.6125559917.

The spelling of 666740140 in words is "six hundred sixty-six million, seven hundred forty thousand, one hundred forty".