66660387365 has 32 divisors (see below), whose sum is σ = 93999854592. Its totient is φ = 44740224000.

The previous prime is 66660387361. The next prime is 66660387371. The reversal of 66660387365 is 56378306666.

It is not a de Polignac number, because 66660387365 - 2² = 66660387361 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66660387365.

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 31 ways as a sum of consecutive naturals, for example, 3903245 + ... + 3920285.

It is an arithmetic number, because the mean of its divisors is an integer number (2937495456).

Almost surely, 2^66660387365 is an apocalyptic number.

66660387365 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

66660387365 is a deficient number, since it is larger than the sum of its proper divisors (27339467227).

66660387365 is a wasteful number, since it uses less digits than its factorization.

66660387365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22541.

The product of its (nonzero) digits is 19595520, while the sum is 56.

The spelling of 66660387365 in words is "sixty-six billion, six hundred sixty million, three hundred eighty-seven thousand, three hundred sixty-five".