66152421 has 12 divisors (see below), whose sum is σ = 96164172. Its totient is φ = 43819776.

The previous prime is 66152417. The next prime is 66152479. The reversal of 66152421 is 12425166.

66152421 is a `hidden beast` number, since 6 + 615 + 2 + 42 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 34680321 + 31472100 = 5889^2 + 5610^2 .

It is not a de Polignac number, because 66152421 - 2² = 66152417 is a prime.

It is a super-2 number, since 2×66152421² = 8752285608322482, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66152221) 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 11 ways as a sum of consecutive naturals, for example, 21996 + ... + 24821.

It is an arithmetic number, because the mean of its divisors is an integer number (8013681).

Almost surely, 2^66152421 is an apocalyptic number.

It is an amenable number.

66152421 is a deficient number, since it is larger than the sum of its proper divisors (30011751).

66152421 is a wasteful number, since it uses less digits than its factorization.

66152421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46980 (or 46977 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 66152421 is about 8133.4138588910. The cubic root of 66152421 is about 404.4348587679.

Adding to 66152421 its reverse (12425166), we get a palindrome (78577587).

The spelling of 66152421 in words is "sixty-six million, one hundred fifty-two thousand, four hundred twenty-one".