66631250 has 48 divisors (see below), whose sum is σ = 142865856. Its totient is φ = 22830000.

The previous prime is 66631223. The next prime is 66631277. The reversal of 66631250 is 5213666.

It is an interprime number because it is at equal distance from previous prime (66631223) and next prime (66631277).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42989 + ... + 44511.

It is an arithmetic number, because the mean of its divisors is an integer number (2976372).

Almost surely, 2^66631250 is an apocalyptic number.

66631250 is an abundant number, since it is smaller than the sum of its proper divisors (76234606).

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

66631250 is an equidigital number, since it uses as much as digits as its factorization.

66631250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1557 (or 1537 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 66631250 is about 8162.7967021114. The cubic root of 66631250 is about 405.4083165457.

The spelling of 66631250 in words is "sixty-six million, six hundred thirty-one thousand, two hundred fifty".