21663546625146 has 64 divisors (see below), whose sum is σ = 44049361628160. Its totient is φ = 7101846581760.

The previous prime is 21663546625109. The next prime is 21663546625163. The reversal of 21663546625146 is 64152664536612.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 79316565 + ... + 79589223.

It is an arithmetic number, because the mean of its divisors is an integer number (688271275440).

Almost surely, 2^{21663546625146} is an apocalyptic number.

21663546625146 is an abundant number, since it is smaller than the sum of its proper divisors (22385815003014).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21663546625146 is a wasteful number, since it uses less digits than its factorization.

21663546625146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273619.

The product of its digits is 37324800, while the sum is 57.

The spelling of 21663546625146 in words is "twenty-one trillion, six hundred sixty-three billion, five hundred forty-six million, six hundred twenty-five thousand, one hundred forty-six".