66320331 has 32 divisors (see below), whose sum is σ = 112347648. Its totient is φ = 33795840.

The previous prime is 66320327. The next prime is 66320333. The reversal of 66320331 is 13302366.

It is not a de Polignac number, because 66320331 - 2² = 66320327 is a prime.

It is a super-2 number, since 2×66320331² = 8796772607899122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66320333) 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, 9535 + ... + 14951.

It is an arithmetic number, because the mean of its divisors is an integer number (3510864).

Almost surely, 2^66320331 is an apocalyptic number.

66320331 is a deficient number, since it is larger than the sum of its proper divisors (46027317).

66320331 is a wasteful number, since it uses less digits than its factorization.

66320331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5491.

The product of its (nonzero) digits is 1944, while the sum is 24.

The square root of 66320331 is about 8143.7295510104. The cubic root of 66320331 is about 404.7767524385.

Adding to 66320331 its reverse (13302366), we get a palindrome (79622697).

The spelling of 66320331 in words is "sixty-six million, three hundred twenty thousand, three hundred thirty-one".