66660387366 has 16 divisors (see below), whose sum is σ = 135580449600. Its totient is φ = 21843516648.

The previous prime is 66660387361. The next prime is 66660387371. The reversal of 66660387366 is 66378306666.

It is an interprime number because it is at equal distance from previous prime (66660387361) and next prime (66660387371).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66660387361) 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, 94152736 + ... + 94153443.

It is an arithmetic number, because the mean of its divisors is an integer number (8473778100).

Almost surely, 2^66660387366 is an apocalyptic number.

66660387366 is an abundant number, since it is smaller than the sum of its proper divisors (68920062234).

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

66660387366 is a wasteful number, since it uses less digits than its factorization.

66660387366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188306243.

The product of its (nonzero) digits is 23514624, while the sum is 57.

The spelling of 66660387366 in words is "sixty-six billion, six hundred sixty million, three hundred eighty-seven thousand, three hundred sixty-six".