666477040 has 20 divisors (see below), whose sum is σ = 1549559304. Its totient is φ = 266590784.

The previous prime is 666477023. The next prime is 666477047. The reversal of 666477040 is 40774666.

It is a tau number, because it is divible by the number of its divisors (20).

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 = 666476984 and 666477002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666477047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4165402 + ... + 4165561.

Almost surely, 2^666477040 is an apocalyptic number.

It is an amenable number.

666477040 is an abundant number, since it is smaller than the sum of its proper divisors (883082264).

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

666477040 is a wasteful number, since it uses less digits than its factorization.

666477040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8330976 (or 8330970 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 40.

The square root of 666477040 is about 25816.2166089456. The cubic root of 666477040 is about 873.4976298061.

The spelling of 666477040 in words is "six hundred sixty-six million, four hundred seventy-seven thousand, forty".