66116540 has 24 divisors (see below), whose sum is σ = 158680032. Its totient is φ = 22668480.

The previous prime is 66116539. The next prime is 66116543. The reversal of 66116540 is 4561166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66116543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 235991 + ... + 236270.

It is an arithmetic number, because the mean of its divisors is an integer number (6611668).

Almost surely, 2^66116540 is an apocalyptic number.

It is an amenable number.

66116540 is an abundant number, since it is smaller than the sum of its proper divisors (92563492).

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

66116540 is a wasteful number, since it uses less digits than its factorization.

66116540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472277 (or 472275 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 66116540 is about 8131.2077823654. The cubic root of 66116540 is about 404.3617238701.

The spelling of 66116540 in words is "sixty-six million, one hundred sixteen thousand, five hundred forty".