66111540 has 48 divisors (see below), whose sum is σ = 201942720. Its totient is φ = 16026880.

The previous prime is 66111527. The next prime is 66111559. The reversal of 66111540 is 4511166.

It is a self number, because there is not a number n which added to its sum of digits gives 66111540.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49425 + ... + 50744.

It is an arithmetic number, because the mean of its divisors is an integer number (4207140).

Almost surely, 2^66111540 is an apocalyptic number.

66111540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66111540 is an abundant number, since it is smaller than the sum of its proper divisors (135831180).

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

66111540 is a wasteful number, since it uses less digits than its factorization.

66111540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100192 (or 100190 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 66111540 is about 8130.9003191529. The cubic root of 66111540 is about 404.3515304571.

The spelling of 66111540 in words is "sixty-six million, one hundred eleven thousand, five hundred forty".