640146348487 has 2 divisors, whose sum is σ = 640146348488. Its totient is φ = 640146348486.

The previous prime is 640146348473. The next prime is 640146348497. The reversal of 640146348487 is 784843641046.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 640146348487 - 2³⁹ = 90390534599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640146348467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320073174243 + 320073174244.

It is an arithmetic number, because the mean of its divisors is an integer number (320073174244).

Almost surely, 2^640146348487 is an apocalyptic number.

640146348487 is a deficient number, since it is larger than the sum of its proper divisors (1).

640146348487 is an equidigital number, since it uses as much as digits as its factorization.

640146348487 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12386304, while the sum is 55.

The spelling of 640146348487 in words is "six hundred forty billion, one hundred forty-six million, three hundred forty-eight thousand, four hundred eighty-seven".