66541580 has 24 divisors (see below), whose sum is σ = 159700128. Its totient is φ = 22814208.

The previous prime is 66541571. The next prime is 66541589. The reversal of 66541580 is 8514566.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (66541571) and next prime (66541589).

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 66541580.

It is not an unprimeable number, because it can be changed into a prime (66541589) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 237509 + ... + 237788.

It is an arithmetic number, because the mean of its divisors is an integer number (6654172).

Almost surely, 2^66541580 is an apocalyptic number.

It is an amenable number.

66541580 is an abundant number, since it is smaller than the sum of its proper divisors (93158548).

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

66541580 is a wasteful number, since it uses less digits than its factorization.

66541580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475313 (or 475311 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 66541580 is about 8157.3022501315. The cubic root of 66541580 is about 405.2263734711.

The spelling of 66541580 in words is "sixty-six million, five hundred forty-one thousand, five hundred eighty".