66675540 has 24 divisors (see below), whose sum is σ = 186691680. Its totient is φ = 17780128.

The previous prime is 66675533. The next prime is 66675559. The reversal of 66675540 is 4557666.

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, 555570 + ... + 555689.

It is an arithmetic number, because the mean of its divisors is an integer number (7778820).

Almost surely, 2^66675540 is an apocalyptic number.

66675540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66675540 is an abundant number, since it is smaller than the sum of its proper divisors (120016140).

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

66675540 is a wasteful number, since it uses less digits than its factorization.

66675540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1111271 (or 1111269 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 39.

The square root of 66675540 is about 8165.5091696722. The cubic root of 66675540 is about 405.4981220420.

The spelling of 66675540 in words is "sixty-six million, six hundred seventy-five thousand, five hundred forty".