66539474 has 8 divisors (see below), whose sum is σ = 102243708. Its totient is φ = 32458240.

The previous prime is 66539461. The next prime is 66539477. The reversal of 66539474 is 47493566.

It can be written as a sum of positive squares in 2 ways, for example, as 57866449 + 8673025 = 7607^2 + 2945^2 .

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

It is not an unprimeable number, because it can be changed into a prime (66539477) 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, 405647 + ... + 405810.

Almost surely, 2^66539474 is an apocalyptic number.

66539474 is a deficient number, since it is larger than the sum of its proper divisors (35704234).

66539474 is a wasteful number, since it uses less digits than its factorization.

66539474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811500.

The product of its digits is 544320, while the sum is 44.

The square root of 66539474 is about 8157.1731623155. The cubic root of 66539474 is about 405.2220983710. Note that the first 3 decimals are identical.

The spelling of 66539474 in words is "sixty-six million, five hundred thirty-nine thousand, four hundred seventy-four".