64987947337 has 2 divisors, whose sum is σ = 64987947338. Its totient is φ = 64987947336.

The previous prime is 64987947319. The next prime is 64987947341. The reversal of 64987947337 is 73374978946.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54131140921 + 10856806416 = 232661^2 + 104196^2 .

It is a cyclic number.

It is not a de Polignac number, because 64987947337 - 2⁷ = 64987947209 is a prime.

It is not a weakly prime, because it can be changed into another prime (64987947317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32493973668 + 32493973669.

It is an arithmetic number, because the mean of its divisors is an integer number (32493973669).

Almost surely, 2^64987947337 is an apocalyptic number.

It is an amenable number.

64987947337 is a deficient number, since it is larger than the sum of its proper divisors (1).

64987947337 is an equidigital number, since it uses as much as digits as its factorization.

64987947337 is an evil number, because the sum of its binary digits is even.

The product of its digits is 192036096, while the sum is 67.

The spelling of 64987947337 in words is "sixty-four billion, nine hundred eighty-seven million, nine hundred forty-seven thousand, three hundred thirty-seven".