21663161660514 has 64 divisors (see below), whose sum is σ = 47805274189440. Its totient is φ = 6489764160000.

The previous prime is 21663161660501. The next prime is 21663161660519. The reversal of 21663161660514 is 41506616136612.

It is a super-3 number, since 3×21663161660514³ (a number of 41 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21663161660519) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1947982 + ... + 6864470.

It is an arithmetic number, because the mean of its divisors is an integer number (746957409210).

Almost surely, 2^{21663161660514} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21663161660514, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23902637094720).

21663161660514 is an abundant number, since it is smaller than the sum of its proper divisors (26142112528926).

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

21663161660514 is a wasteful number, since it uses less digits than its factorization.

21663161660514 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4917267.

The product of its (nonzero) digits is 933120, while the sum is 48.

The spelling of 21663161660514 in words is "twenty-one trillion, six hundred sixty-three billion, one hundred sixty-one million, six hundred sixty thousand, five hundred fourteen".