20456211626161 has 4 divisors (see below), whose sum is σ = 20456510556672. Its totient is φ = 20455912695652.

The previous prime is 20456211626129. The next prime is 20456211626219. The reversal of 20456211626161 is 16162611265402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20456211626161 - 2⁵ = 20456211626129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20456211626101) 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, 149362585 + ... + 149499478.

It is an arithmetic number, because the mean of its divisors is an integer number (5114127639168).

Almost surely, 2^{20456211626161} is an apocalyptic number.

It is an amenable number.

20456211626161 is a deficient number, since it is larger than the sum of its proper divisors (298930511).

20456211626161 is an equidigital number, since it uses as much as digits as its factorization.

20456211626161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298930510.

The product of its (nonzero) digits is 207360, while the sum is 43.

The spelling of 20456211626161 in words is "twenty trillion, four hundred fifty-six billion, two hundred eleven million, six hundred twenty-six thousand, one hundred sixty-one".