64331366381 has 2 divisors, whose sum is σ = 64331366382. Its totient is φ = 64331366380.

The previous prime is 64331366371. The next prime is 64331366417. The reversal of 64331366381 is 18366313346.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47021754025 + 17309612356 = 216845^2 + 131566^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64331366381 is a prime.

It is a super-2 number, since 2×64331366381² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64331366371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32165683190 + 32165683191.

It is an arithmetic number, because the mean of its divisors is an integer number (32165683191).

Almost surely, 2^64331366381 is an apocalyptic number.

It is an amenable number.

64331366381 is a deficient number, since it is larger than the sum of its proper divisors (1).

64331366381 is an equidigital number, since it uses as much as digits as its factorization.

64331366381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 559872, while the sum is 44.

The spelling of 64331366381 in words is "sixty-four billion, three hundred thirty-one million, three hundred sixty-six thousand, three hundred eighty-one".