66201291 has 48 divisors (see below), whose sum is σ = 109252416. Its totient is φ = 38320128.

The previous prime is 66201257. The next prime is 66201307. The reversal of 66201291 is 19210266.

It is not a de Polignac number, because 66201291 - 2⁶ = 66201227 is a prime.

It is a super-2 number, since 2×66201291² = 8765221860133362, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66206291) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 196275 + ... + 196611.

It is an arithmetic number, because the mean of its divisors is an integer number (2276092).

Almost surely, 2^66201291 is an apocalyptic number.

66201291 is a deficient number, since it is larger than the sum of its proper divisors (43051125).

66201291 is a wasteful number, since it uses less digits than its factorization.

66201291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452 (or 449 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 66201291 is about 8136.4175777795. The cubic root of 66201291 is about 404.5344261316.

Subtracting from 66201291 its reverse (19210266), we obtain a square (46991025 = 6855²).

The spelling of 66201291 in words is "sixty-six million, two hundred one thousand, two hundred ninety-one".