66503740 has 12 divisors (see below), whose sum is σ = 139657896. Its totient is φ = 26601488.

The previous prime is 66503707. The next prime is 66503761. The reversal of 66503740 is 4730566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1662574 + ... + 1662613.

It is an arithmetic number, because the mean of its divisors is an integer number (11638158).

Almost surely, 2^66503740 is an apocalyptic number.

It is an amenable number.

66503740 is an abundant number, since it is smaller than the sum of its proper divisors (73154156).

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

66503740 is a wasteful number, since it uses less digits than its factorization.

66503740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3325196 (or 3325194 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 31.

The square root of 66503740 is about 8154.9825260389. The cubic root of 66503740 is about 405.1495459522.

The spelling of 66503740 in words is "sixty-six million, five hundred three thousand, seven hundred forty".