64946628034181 has 2 divisors, whose sum is σ = 64946628034182. Its totient is φ = 64946628034180.

The previous prime is 64946628034177. The next prime is 64946628034207. The reversal of 64946628034181 is 18143082664946.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49666777021156 + 15279851013025 = 7047466^2 + 3908945^2 .

It is a cyclic number.

It is not a de Polignac number, because 64946628034181 - 2² = 64946628034177 is a prime.

It is a super-2 number, since 2×64946628034181² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64946628034151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32473314017090 + 32473314017091.

It is an arithmetic number, because the mean of its divisors is an integer number (32473314017091).

Almost surely, 2^{64946628034181} is an apocalyptic number.

It is an amenable number.

64946628034181 is a deficient number, since it is larger than the sum of its proper divisors (1).

64946628034181 is an equidigital number, since it uses as much as digits as its factorization.

64946628034181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 47775744, while the sum is 62.

The spelling of 64946628034181 in words is "sixty-four trillion, nine hundred forty-six billion, six hundred twenty-eight million, thirty-four thousand, one hundred eighty-one".