66526840 has 32 divisors (see below), whose sum is σ = 150148080. Its totient is φ = 26528512.

The previous prime is 66526799. The next prime is 66526843. The reversal of 66526840 is 4862566.

It is a self number, because there is not a number n which added to its sum of digits gives 66526840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66526843) 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, 11484 + ... + 16276.

Almost surely, 2^66526840 is an apocalyptic number.

It is an amenable number.

66526840 is an abundant number, since it is smaller than the sum of its proper divisors (83621240).

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

66526840 is a wasteful number, since it uses less digits than its factorization.

66526840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5151 (or 5147 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 37.

The square root of 66526840 is about 8156.3987151193. The cubic root of 66526840 is about 405.1964499364.

The spelling of 66526840 in words is "sixty-six million, five hundred twenty-six thousand, eight hundred forty".