5405661066 has 64 divisors (see below), whose sum is σ = 12355338240. Its totient is φ = 1563967680.

The previous prime is 5405661013. The next prime is 5405661073. The reversal of 5405661066 is 6601665045.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 80311 + ... + 131381.

It is an arithmetic number, because the mean of its divisors is an integer number (193052160).

Almost surely, 2^5405661066 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 5405661066, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6177669120).

5405661066 is an abundant number, since it is smaller than the sum of its proper divisors (6949677174).

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

5405661066 is a wasteful number, since it uses less digits than its factorization.

5405661066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51171.

The product of its (nonzero) digits is 129600, while the sum is 39.

The square root of 5405661066 is about 73523.2008688414. The cubic root of 5405661066 is about 1755.0235050139.

The spelling of 5405661066 in words is "five billion, four hundred five million, six hundred sixty-one thousand, sixty-six".