66332531 has 8 divisors (see below), whose sum is σ = 68834304. Its totient is φ = 63874440.

The previous prime is 66332507. The next prime is 66332533. The reversal of 66332531 is 13523366.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66332531 - 2¹⁸ = 66070387 is a prime.

It is a super-2 number, since 2×66332531² = 8800009337731922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66332494 and 66332503.

It is not an unprimeable number, because it can be changed into a prime (66332533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7811 + ... + 13916.

It is an arithmetic number, because the mean of its divisors is an integer number (8604288).

Almost surely, 2^66332531 is an apocalyptic number.

66332531 is a deficient number, since it is larger than the sum of its proper divisors (2501773).

66332531 is a wasteful number, since it uses less digits than its factorization.

66332531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21841.

The product of its digits is 9720, while the sum is 29.

The square root of 66332531 is about 8144.4785591221. The cubic root of 66332531 is about 404.8015712410.

Adding to 66332531 its reverse (13523366), we get a palindrome (79855897).

The spelling of 66332531 in words is "sixty-six million, three hundred thirty-two thousand, five hundred thirty-one".