20451242215161 has 12 divisors (see below), whose sum is σ = 31095455999920. Its totient is φ = 12916574030520.

The previous prime is 20451242215127. The next prime is 20451242215169. The reversal of 20451242215161 is 16151224215402.

20451242215161 is a `hidden beast` number, since 2 + 0 + 45 + 1 + 242 + 215 + 161 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-20451242215161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20451242215169) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 59798953675 + ... + 59798954016.

Almost surely, 2^{20451242215161} is an apocalyptic number.

It is an amenable number.

20451242215161 is a deficient number, since it is larger than the sum of its proper divisors (10644213784759).

20451242215161 is a wasteful number, since it uses less digits than its factorization.

20451242215161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119597907716 (or 119597907713 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 36.

The spelling of 20451242215161 in words is "twenty trillion, four hundred fifty-one billion, two hundred forty-two million, two hundred fifteen thousand, one hundred sixty-one".