1640859267493 has 2 divisors, whose sum is σ = 1640859267494. Its totient is φ = 1640859267492.

The previous prime is 1640859267457. The next prime is 1640859267497. The reversal of 1640859267493 is 3947629580461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1622877262084 + 17982005409 = 1273922^2 + 134097^2 .

It is a cyclic number.

It is not a de Polignac number, because 1640859267493 - 2²⁵ = 1640825713061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1640859267497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820429633746 + 820429633747.

It is an arithmetic number, because the mean of its divisors is an integer number (820429633747).

It is a 1-persistent number, because it is pandigital, but 2⋅1640859267493 = 3281718534986 is not.

Almost surely, 2^{1640859267493} is an apocalyptic number.

It is an amenable number.

1640859267493 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640859267493 is an equidigital number, since it uses as much as digits as its factorization.

1640859267493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 78382080, while the sum is 64.

The spelling of 1640859267493 in words is "one trillion, six hundred forty billion, eight hundred fifty-nine million, two hundred sixty-seven thousand, four hundred ninety-three".