5404407666 has 48 divisors (see below), whose sum is σ = 12611061216. Its totient is φ = 1539506304.

The previous prime is 5404407649. The next prime is 5404407713. The reversal of 5404407666 is 6667044045.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 71805 + ... + 126351.

It is an arithmetic number, because the mean of its divisors is an integer number (262730442).

Almost surely, 2^5404407666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 5404407666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6305530608).

5404407666 is an abundant number, since it is smaller than the sum of its proper divisors (7206653550).

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

5404407666 is a wasteful number, since it uses less digits than its factorization.

5404407666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54903 (or 54896 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 42.

The square root of 5404407666 is about 73514.6765346893. The cubic root of 5404407666 is about 1754.8878499125.

The spelling of 5404407666 in words is "five billion, four hundred four million, four hundred seven thousand, six hundred sixty-six".