666120940240 has 80 divisors (see below), whose sum is σ = 1874094907392. Its totient is φ = 214949947392.

The previous prime is 666120940181. The next prime is 666120940249. The reversal of 666120940240 is 42049021666.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 666120940193 and 666120940202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666120940249) 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, 34975824 + ... + 34994863.

Almost surely, 2^666120940240 is an apocalyptic number.

It is an amenable number.

666120940240 is an abundant number, since it is smaller than the sum of its proper divisors (1207973967152).

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

666120940240 is a wasteful number, since it uses less digits than its factorization.

666120940240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69970724 (or 69970718 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 40.

The spelling of 666120940240 in words is "six hundred sixty-six billion, one hundred twenty million, nine hundred forty thousand, two hundred forty".