64454945549 has 2 divisors, whose sum is σ = 64454945550. Its totient is φ = 64454945548.

The previous prime is 64454945537. The next prime is 64454945603. The reversal of 64454945549 is 94554945446.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39207960100 + 25246985449 = 198010^2 + 158893^2 .

It is a cyclic number.

It is not a de Polignac number, because 64454945549 - 2¹⁶ = 64454880013 is a prime.

It is a super-2 number, since 2×64454945549² (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 (64454945249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32227472774 + 32227472775.

It is an arithmetic number, because the mean of its divisors is an integer number (32227472775).

Almost surely, 2^64454945549 is an apocalyptic number.

It is an amenable number.

64454945549 is a deficient number, since it is larger than the sum of its proper divisors (1).

64454945549 is an equidigital number, since it uses as much as digits as its factorization.

64454945549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208000, while the sum is 59.

The spelling of 64454945549 in words is "sixty-four billion, four hundred fifty-four million, nine hundred forty-five thousand, five hundred forty-nine".