20152566483921 has 9 divisors (see below), whose sum is σ = 29109282152041. Its totient is φ = 13435035344292.

The previous prime is 20152566483919. The next prime is 20152566483961. The reversal of 20152566483921 is 12938466525102.

The square root of 20152566483921 is 4489161.

It is a perfect power (a square), and thus also a powerful number.

20152566483921 is a `hidden beast` number, since 2 + 0 + 1 + 5 + 2 + 566 + 48 + 39 + 2 + 1 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 20152566483921 - 2¹ = 20152566483919 is a prime.

It is a super-2 number, since 2×20152566483921² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20152566483961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 12719290 + ... + 14215676.

Almost surely, 2^{20152566483921} is an apocalyptic number.

20152566483921 is the 4489161-st square number.

20152566483921 is the 2244581-st centered octagonal number.

It is an amenable number.

20152566483921 is a deficient number, since it is larger than the sum of its proper divisors (8956715668120).

20152566483921 is an frugal number, since it uses more digits than its factorization.

20152566483921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2992780 (or 1496390 counting only the distinct ones).

The product of its (nonzero) digits is 6220800, while the sum is 54.

The spelling of 20152566483921 in words is "twenty trillion, one hundred fifty-two billion, five hundred sixty-six million, four hundred eighty-three thousand, nine hundred twenty-one".