66250641625 has 64 divisors (see below), whose sum is σ = 100397905920. Its totient is φ = 42634641600.

The previous prime is 66250641623. The next prime is 66250641637. The reversal of 66250641625 is 52614605266.

It is a happy number.

It is not a de Polignac number, because 66250641625 - 2¹ = 66250641623 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66250641623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1760254 + ... + 1797496.

It is an arithmetic number, because the mean of its divisors is an integer number (1568717280).

Almost surely, 2^66250641625 is an apocalyptic number.

It is an amenable number.

66250641625 is a deficient number, since it is larger than the sum of its proper divisors (34147264295).

66250641625 is a wasteful number, since it uses less digits than its factorization.

66250641625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37391 (or 37381 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 43.

The spelling of 66250641625 in words is "sixty-six billion, two hundred fifty million, six hundred forty-one thousand, six hundred twenty-five".