1628657638593 has 4 divisors (see below), whose sum is σ = 2171543518128. Its totient is φ = 1085771759060.

The previous prime is 1628657638589. The next prime is 1628657638607. The reversal of 1628657638593 is 3958367568261.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1628657638593 - 2² = 1628657638589 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1628657628593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 271442939763 + ... + 271442939768.

It is an arithmetic number, because the mean of its divisors is an integer number (542885879532).

Almost surely, 2^{1628657638593} is an apocalyptic number.

It is an amenable number.

1628657638593 is a deficient number, since it is larger than the sum of its proper divisors (542885879535).

1628657638593 is an equidigital number, since it uses as much as digits as its factorization.

1628657638593 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 542885879534.

The product of its digits is 391910400, while the sum is 69.

The spelling of 1628657638593 in words is "one trillion, six hundred twenty-eight billion, six hundred fifty-seven million, six hundred thirty-eight thousand, five hundred ninety-three".