1616553422405 has 4 divisors (see below), whose sum is σ = 1939864106892. Its totient is φ = 1293242737920.

The previous prime is 1616553422381. The next prime is 1616553422411. The reversal of 1616553422405 is 5042243556161.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1281240622561 + 335312799844 = 1131919^2 + 579062^2 .

It is not a de Polignac number, because 1616553422405 - 2²⁸ = 1616284986949 is a prime.

It is a super-2 number, since 2×1616553422405² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161655342236 + ... + 161655342245.

It is an arithmetic number, because the mean of its divisors is an integer number (484966026723).

Almost surely, 2^{1616553422405} is an apocalyptic number.

It is an amenable number.

1616553422405 is a deficient number, since it is larger than the sum of its proper divisors (323310684487).

1616553422405 is an equidigital number, since it uses as much as digits as its factorization.

1616553422405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323310684486.

The product of its (nonzero) digits is 864000, while the sum is 44.

Adding to 1616553422405 its reverse (5042243556161), we get a palindrome (6658796978566).

The spelling of 1616553422405 in words is "one trillion, six hundred sixteen billion, five hundred fifty-three million, four hundred twenty-two thousand, four hundred five".