66275978140 has 24 divisors (see below), whose sum is σ = 139200369840. Its totient is φ = 26506426368.

The previous prime is 66275978137. The next prime is 66275978191. The reversal of 66275978140 is 4187957266.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108837 + ... + 379996.

It is an arithmetic number, because the mean of its divisors is an integer number (5800015410).

Almost surely, 2^66275978140 is an apocalyptic number.

It is an amenable number.

66275978140 is an abundant number, since it is smaller than the sum of its proper divisors (72924391700).

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

66275978140 is a wasteful number, since it uses less digits than its factorization.

66275978140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495621 (or 495619 counting only the distinct ones).

The product of its (nonzero) digits is 5080320, while the sum is 55.

The spelling of 66275978140 in words is "sixty-six billion, two hundred seventy-five million, nine hundred seventy-eight thousand, one hundred forty".