1628352538261 has 4 divisors (see below), whose sum is σ = 1629132776352. Its totient is φ = 1627572300172.

The previous prime is 1628352538243. The next prime is 1628352538271.

1628352538261 is nontrivially palindromic in base 10.

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 1628352538261 - 2⁷ = 1628352538133 is a prime.

It is a super-2 number, since 2×1628352538261² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1628352538199 and 1628352538208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1628352538231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 390115915 + ... + 390120088.

It is an arithmetic number, because the mean of its divisors is an integer number (407283194088).

Almost surely, 2^{1628352538261} is an apocalyptic number.

It is an amenable number.

1628352538261 is a deficient number, since it is larger than the sum of its proper divisors (780238091).

1628352538261 is an equidigital number, since it uses as much as digits as its factorization.

1628352538261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 780238090.

The product of its digits is 4147200, while the sum is 52.

The spelling of 1628352538261 in words is "one trillion, six hundred twenty-eight billion, three hundred fifty-two million, five hundred thirty-eight thousand, two hundred sixty-one".