64227490637 has 2 divisors, whose sum is σ = 64227490638. Its totient is φ = 64227490636.

The previous prime is 64227490631. The next prime is 64227490673. The reversal of 64227490637 is 73609472246.

Together with next prime (64227490673) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51248357161 + 12979133476 = 226381^2 + 113926^2 .

It is a cyclic number.

It is not a de Polignac number, because 64227490637 - 2²⁰ = 64226442061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64227490631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32113745318 + 32113745319.

It is an arithmetic number, because the mean of its divisors is an integer number (32113745319).

Almost surely, 2^64227490637 is an apocalyptic number.

It is an amenable number.

64227490637 is a deficient number, since it is larger than the sum of its proper divisors (1).

64227490637 is an equidigital number, since it uses as much as digits as its factorization.

64227490637 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3048192, while the sum is 50.

The spelling of 64227490637 in words is "sixty-four billion, two hundred twenty-seven million, four hundred ninety thousand, six hundred thirty-seven".