1640253613 has 2 divisors, whose sum is σ = 1640253614. Its totient is φ = 1640253612.

The previous prime is 1640253577. The next prime is 1640253661. The reversal of 1640253613 is 3163520461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1632402409 + 7851204 = 40403^2 + 2802^2 .

It is a cyclic number.

It is not a de Polignac number, because 1640253613 - 2¹³ = 1640245421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1640253673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820126806 + 820126807.

It is an arithmetic number, because the mean of its divisors is an integer number (820126807).

Almost surely, 2^1640253613 is an apocalyptic number.

It is an amenable number.

1640253613 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640253613 is an equidigital number, since it uses as much as digits as its factorization.

1640253613 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 1640253613 is about 40500.0446049137. The cubic root of 1640253613 is about 1179.3344933045.

The spelling of 1640253613 in words is "one billion, six hundred forty million, two hundred fifty-three thousand, six hundred thirteen".