66725560 has 64 divisors (see below), whose sum is σ = 165110400. Its totient is φ = 24067200.

The previous prime is 66725539. The next prime is 66725567. The reversal of 66725560 is 6552766.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66725567) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60615 + ... + 61705.

It is an arithmetic number, because the mean of its divisors is an integer number (2579850).

Almost surely, 2^66725560 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66725560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82555200).

66725560 is an abundant number, since it is smaller than the sum of its proper divisors (98384840).

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

66725560 is a wasteful number, since it uses less digits than its factorization.

66725560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1252 (or 1248 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 37.

The square root of 66725560 is about 8168.5714785389. The cubic root of 66725560 is about 405.5994982792.

The spelling of 66725560 in words is "sixty-six million, seven hundred twenty-five thousand, five hundred sixty".