66312655231361 has 64 divisors (see below), whose sum is σ = 87533158809600. Its totient is φ = 48668642510400.

The previous prime is 66312655231357. The next prime is 66312655231379. The reversal of 66312655231361 is 16313255621366.

It is not a de Polignac number, because 66312655231361 - 2² = 66312655231357 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66312655231301) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 173656106 + ... + 174037548.

It is an arithmetic number, because the mean of its divisors is an integer number (1367705606400).

Almost surely, 2^{66312655231361} is an apocalyptic number.

It is an amenable number.

66312655231361 is a deficient number, since it is larger than the sum of its proper divisors (21220503578239).

66312655231361 is a wasteful number, since it uses less digits than its factorization.

66312655231361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382170.

The product of its digits is 3499200, while the sum is 50.

The spelling of 66312655231361 in words is "sixty-six trillion, three hundred twelve billion, six hundred fifty-five million, two hundred thirty-one thousand, three hundred sixty-one".