2146402165561 has 16 divisors (see below), whose sum is σ = 2189387646720. Its totient is φ = 2103954652800.

The previous prime is 2146402165549. The next prime is 2146402165603. The reversal of 2146402165561 is 1655612046412.

It is a cyclic number.

It is not a de Polignac number, because 2146402165561 - 2⁵ = 2146402165529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2146402165511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3747661 + ... + 4282261.

It is an arithmetic number, because the mean of its divisors is an integer number (136836727920).

Almost surely, 2^{2146402165561} is an apocalyptic number.

It is an amenable number.

2146402165561 is a deficient number, since it is larger than the sum of its proper divisors (42985481159).

2146402165561 is a wasteful number, since it uses less digits than its factorization.

2146402165561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535104.

The product of its (nonzero) digits is 345600, while the sum is 43.

The spelling of 2146402165561 in words is "two trillion, one hundred forty-six billion, four hundred two million, one hundred sixty-five thousand, five hundred sixty-one".