1640622563 has 4 divisors (see below), whose sum is σ = 1640713440. Its totient is φ = 1640531688.

The previous prime is 1640622551. The next prime is 1640622589. The reversal of 1640622563 is 3652260461.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3652260461 = 691 ⋅5285471.

It is a cyclic number.

It is not a de Polignac number, because 1640622563 - 2¹⁸ = 1640360419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1640622523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8168 + ... + 57861.

It is an arithmetic number, because the mean of its divisors is an integer number (410178360).

Almost surely, 2^1640622563 is an apocalyptic number.

1640622563 is a deficient number, since it is larger than the sum of its proper divisors (90877).

1640622563 is an equidigital number, since it uses as much as digits as its factorization.

1640622563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90876.

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 1640622563 is about 40504.5992820568. The cubic root of 1640622563 is about 1179.4229111032.

The spelling of 1640622563 in words is "one billion, six hundred forty million, six hundred twenty-two thousand, five hundred sixty-three".