64337606981 has 2 divisors, whose sum is σ = 64337606982. Its totient is φ = 64337606980.

The previous prime is 64337606947. The next prime is 64337606999. The reversal of 64337606981 is 18960673346.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60831782881 + 3505824100 = 246641^2 + 59210^2 .

It is a cyclic number.

It is not a de Polignac number, because 64337606981 - 2¹⁸ = 64337344837 is a prime.

It is a super-2 number, since 2×64337606981² (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 (64337600981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32168803490 + 32168803491.

It is an arithmetic number, because the mean of its divisors is an integer number (32168803491).

Almost surely, 2^64337606981 is an apocalyptic number.

It is an amenable number.

64337606981 is a deficient number, since it is larger than the sum of its proper divisors (1).

64337606981 is an equidigital number, since it uses as much as digits as its factorization.

64337606981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3919104, while the sum is 53.

The spelling of 64337606981 in words is "sixty-four billion, three hundred thirty-seven million, six hundred six thousand, nine hundred eighty-one".