66523351 has 4 divisors (see below), whose sum is σ = 70024600. Its totient is φ = 63022104.

The previous prime is 66523349. The next prime is 66523393. The reversal of 66523351 is 15332566.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66523351 - 2¹ = 66523349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66520351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1750596 + ... + 1750633.

It is an arithmetic number, because the mean of its divisors is an integer number (17506150).

Almost surely, 2^66523351 is an apocalyptic number.

66523351 is a deficient number, since it is larger than the sum of its proper divisors (3501249).

66523351 is a wasteful number, since it uses less digits than its factorization.

66523351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3501248.

The product of its digits is 16200, while the sum is 31.

The square root of 66523351 is about 8156.1848311573. The cubic root of 66523351 is about 405.1893663035.

The spelling of 66523351 in words is "sixty-six million, five hundred twenty-three thousand, three hundred fifty-one".