640712733337 has 2 divisors, whose sum is σ = 640712733338. Its totient is φ = 640712733336.

The previous prime is 640712733319. The next prime is 640712733373. The reversal of 640712733337 is 733337217046.

640712733337 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with next prime (640712733373) 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., 598365678681 + 42347054656 = 773541^2 + 205784^2 .

It is a cyclic number.

It is not a de Polignac number, because 640712733337 - 2¹⁵ = 640712700569 is a prime.

It is not a weakly prime, because it can be changed into another prime (640712733307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320356366668 + 320356366669.

It is an arithmetic number, because the mean of its divisors is an integer number (320356366669).

Almost surely, 2^640712733337 is an apocalyptic number.

It is an amenable number.

640712733337 is a deficient number, since it is larger than the sum of its proper divisors (1).

640712733337 is an equidigital number, since it uses as much as digits as its factorization.

640712733337 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1333584, while the sum is 46.

The spelling of 640712733337 in words is "six hundred forty billion, seven hundred twelve million, seven hundred thirty-three thousand, three hundred thirty-seven".