66505494 has 32 divisors (see below), whose sum is σ = 147490560. Its totient is φ = 19821600.

The previous prime is 66505471. The next prime is 66505499. The reversal of 66505494 is 49450566.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66505499) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4234 + ... + 12285.

It is an arithmetic number, because the mean of its divisors is an integer number (4609080).

Almost surely, 2^66505494 is an apocalyptic number.

66505494 is an abundant number, since it is smaller than the sum of its proper divisors (80985066).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66505494 is a wasteful number, since it uses less digits than its factorization.

66505494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16596.

The product of its (nonzero) digits is 129600, while the sum is 39.

The square root of 66505494 is about 8155.0900669459. The cubic root of 66505494 is about 405.1531077872.

The spelling of 66505494 in words is "sixty-six million, five hundred five thousand, four hundred ninety-four".