2129406566 has 8 divisors (see below), whose sum is σ = 3650411280. Its totient is φ = 912602808.

The previous prime is 2129406563. The next prime is 2129406571. The reversal of 2129406566 is 6656049212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2129406563) 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, 76050221 + ... + 76050248.

It is an arithmetic number, because the mean of its divisors is an integer number (456301410).

Almost surely, 2^2129406566 is an apocalyptic number.

2129406566 is a deficient number, since it is larger than the sum of its proper divisors (1521004714).

2129406566 is a wasteful number, since it uses less digits than its factorization.

2129406566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152100478.

The product of its (nonzero) digits is 155520, while the sum is 41.

The square root of 2129406566 is about 46145.4934527739. The cubic root of 2129406566 is about 1286.5288501599.

The spelling of 2129406566 in words is "two billion, one hundred twenty-nine million, four hundred six thousand, five hundred sixty-six".