64354016755781 has 2 divisors, whose sum is σ = 64354016755782. Its totient is φ = 64354016755780.

The previous prime is 64354016755751. The next prime is 64354016755813. The reversal of 64354016755781 is 18755761045346.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60151906246756 + 4202110509025 = 7755766^2 + 2049905^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64354016755781 is a prime.

It is a super-2 number, since 2×64354016755781² (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 (64354016755751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32177008377890 + 32177008377891.

It is an arithmetic number, because the mean of its divisors is an integer number (32177008377891).

Almost surely, 2^{64354016755781} is an apocalyptic number.

It is an amenable number.

64354016755781 is a deficient number, since it is larger than the sum of its proper divisors (1).

64354016755781 is an equidigital number, since it uses as much as digits as its factorization.

64354016755781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84672000, while the sum is 62.

The spelling of 64354016755781 in words is "sixty-four trillion, three hundred fifty-four billion, sixteen million, seven hundred fifty-five thousand, seven hundred eighty-one".