146565699921 has 27 divisors (see below), whose sum is σ = 217645541841. Its totient is φ = 95042078784.

The previous prime is 146565699901. The next prime is 146565699949. The reversal of 146565699921 is 129996565641.

The square root of 146565699921 is 382839.

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

146565699921 is a `hidden beast` number, since 1 + 4 + 6 + 565 + 69 + 9 + 9 + 2 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 9544313025 + 137021386896 = 97695^2 + 370164^2 .

It is not a de Polignac number, because 146565699921 - 2¹⁹ = 146565175633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (146565699901) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 42493405 + ... + 42496853.

Almost surely, 2^146565699921 is an apocalyptic number.

146565699921 is the 382839-th square number.

146565699921 is the 191420-th centered octagonal number.

It is an amenable number.

146565699921 is a deficient number, since it is larger than the sum of its proper divisors (71079841920).

146565699921 is an frugal number, since it uses more digits than its factorization.

146565699921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6978 (or 3489 counting only the distinct ones).

The product of its digits is 31492800, while the sum is 63.

The spelling of 146565699921 in words is "one hundred forty-six billion, five hundred sixty-five million, six hundred ninety-nine thousand, nine hundred twenty-one".