66925975648 has 48 divisors (see below), whose sum is σ = 152397745920. Its totient is φ = 28336980096.

The previous prime is 66925975643. The next prime is 66925975673. The reversal of 66925975648 is 84657952966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66925975643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1781268 + ... + 1818451.

It is an arithmetic number, because the mean of its divisors is an integer number (3174953040).

Almost surely, 2^66925975648 is an apocalyptic number.

It is an amenable number.

66925975648 is an abundant number, since it is smaller than the sum of its proper divisors (85471770272).

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

66925975648 is a wasteful number, since it uses less digits than its factorization.

66925975648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3599819 (or 3599811 counting only the distinct ones).

The product of its digits is 195955200, while the sum is 67.

The spelling of 66925975648 in words is "sixty-six billion, nine hundred twenty-five million, nine hundred seventy-five thousand, six hundred forty-eight".