66495540 has 24 divisors (see below), whose sum is σ = 186187680. Its totient is φ = 17732128.

The previous prime is 66495529. The next prime is 66495581. The reversal of 66495540 is 4559466.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 554070 + ... + 554189.

It is an arithmetic number, because the mean of its divisors is an integer number (7757820).

Almost surely, 2^66495540 is an apocalyptic number.

66495540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66495540 is an abundant number, since it is smaller than the sum of its proper divisors (119692140).

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

66495540 is a wasteful number, since it uses less digits than its factorization.

66495540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1108271 (or 1108269 counting only the distinct ones).

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

The square root of 66495540 is about 8154.4797504194. The cubic root of 66495540 is about 405.1328934409.

The spelling of 66495540 in words is "sixty-six million, four hundred ninety-five thousand, five hundred forty".