64437546493 has 2 divisors, whose sum is σ = 64437546494. Its totient is φ = 64437546492.

The previous prime is 64437546457. The next prime is 64437546571. The reversal of 64437546493 is 39464573446.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50228429689 + 14209116804 = 224117^2 + 119202^2 .

It is a cyclic number.

It is not a de Polignac number, because 64437546493 - 2³³ = 55847611901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64437546403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32218773246 + 32218773247.

It is an arithmetic number, because the mean of its divisors is an integer number (32218773247).

Almost surely, 2^64437546493 is an apocalyptic number.

It is an amenable number.

64437546493 is a deficient number, since it is larger than the sum of its proper divisors (1).

64437546493 is an equidigital number, since it uses as much as digits as its factorization.

64437546493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26127360, while the sum is 55.

The spelling of 64437546493 in words is "sixty-four billion, four hundred thirty-seven million, five hundred forty-six thousand, four hundred ninety-three".