1640503426643 has 4 divisors (see below), whose sum is σ = 1711829662608. Its totient is φ = 1569177190680.

The previous prime is 1640503426637. The next prime is 1640503426649. The reversal of 1640503426643 is 3466243050461.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1640503426637) and next prime (1640503426649).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1640503426643 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1640503426594 and 1640503426603.

It is not an unprimeable number, because it can be changed into a prime (1640503426649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35663117948 + ... + 35663117993.

It is an arithmetic number, because the mean of its divisors is an integer number (427957415652).

Almost surely, 2^{1640503426643} is an apocalyptic number.

1640503426643 is a deficient number, since it is larger than the sum of its proper divisors (71326235965).

1640503426643 is an equidigital number, since it uses as much as digits as its factorization.

1640503426643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71326235964.

The product of its (nonzero) digits is 1244160, while the sum is 44.

The spelling of 1640503426643 in words is "one trillion, six hundred forty billion, five hundred three million, four hundred twenty-six thousand, six hundred forty-three".