66851331 has 8 divisors (see below), whose sum is σ = 89331984. Its totient is φ = 44469120.

The previous prime is 66851311. The next prime is 66851377. The reversal of 66851331 is 13315866.

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

It is not a de Polignac number, because 66851331 - 2¹⁴ = 66834947 is a prime.

It is a super-2 number, since 2×66851331² = 8938200912943122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66851292 and 66851301.

It is not an unprimeable number, because it can be changed into a prime (66851311) 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, 23010 + ... + 25751.

It is an arithmetic number, because the mean of its divisors is an integer number (11166498).

Almost surely, 2^66851331 is an apocalyptic number.

66851331 is a deficient number, since it is larger than the sum of its proper divisors (22480653).

66851331 is a wasteful number, since it uses less digits than its factorization.

66851331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49221.

The product of its digits is 12960, while the sum is 33.

The square root of 66851331 is about 8176.2663239403. The cubic root of 66851331 is about 405.8541764803.

The spelling of 66851331 in words is "sixty-six million, eight hundred fifty-one thousand, three hundred thirty-one".