66125990 has 24 divisors (see below), whose sum is σ = 138460752. Its totient is φ = 22671600.

The previous prime is 66125987. The next prime is 66126019. The reversal of 66125990 is 9952166.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66986 + ... + 67965.

It is an arithmetic number, because the mean of its divisors is an integer number (5769198).

Almost surely, 2^66125990 is an apocalyptic number.

66125990 is an abundant number, since it is smaller than the sum of its proper divisors (72334762).

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

66125990 is a wasteful number, since it uses less digits than its factorization.

66125990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134972 (or 134965 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 66125990 is about 8131.7888560882. The cubic root of 66125990 is about 404.3809880172.

The spelling of 66125990 in words is "sixty-six million, one hundred twenty-five thousand, nine hundred ninety".