20166405121 has 8 divisors (see below), whose sum is σ = 20196356544. Its totient is φ = 20136476880.

The previous prime is 20166405113. The next prime is 20166405137. The reversal of 20166405121 is 12150466102.

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

It is a cyclic number.

It is not a de Polignac number, because 20166405121 - 2³ = 20166405113 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20166405121.

It is not an unprimeable number, because it can be changed into a prime (20166405521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2436436 + ... + 2444698.

It is an arithmetic number, because the mean of its divisors is an integer number (2524544568).

Almost surely, 2^20166405121 is an apocalyptic number.

It is an amenable number.

20166405121 is a deficient number, since it is larger than the sum of its proper divisors (29951423).

20166405121 is a wasteful number, since it uses less digits than its factorization.

20166405121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11591.

The product of its (nonzero) digits is 2880, while the sum is 28.

The spelling of 20166405121 in words is "twenty billion, one hundred sixty-six million, four hundred five thousand, one hundred twenty-one".