65381931197667 has 48 divisors (see below), whose sum is σ = 113837956031520. Its totient is φ = 36975937453056.

The previous prime is 65381931197663. The next prime is 65381931197669. The reversal of 65381931197667 is 76679113918356.

It is a happy number.

65381931197667 is a `hidden beast` number, since 6 + 5 + 381 + 9 + 3 + 119 + 76 + 67 = 666.

It is not a de Polignac number, because 65381931197667 - 2² = 65381931197663 is a prime.

It is a super-2 number, since 2×65381931197667² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 65381931197595 and 65381931197604.

It is not an unprimeable number, because it can be changed into a prime (65381931197663) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 254611098 + ... + 254867759.

It is an arithmetic number, because the mean of its divisors is an integer number (2371624083990).

Almost surely, 2^{65381931197667} is an apocalyptic number.

65381931197667 is a deficient number, since it is larger than the sum of its proper divisors (48456024833853).

65381931197667 is a wasteful number, since it uses less digits than its factorization.

65381931197667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509478977 (or 509478964 counting only the distinct ones).

The product of its digits is 308629440, while the sum is 72.

The spelling of 65381931197667 in words is "sixty-five trillion, three hundred eighty-one billion, nine hundred thirty-one million, one hundred ninety-seven thousand, six hundred sixty-seven".