616644450253 has 4 divisors (see below), whose sum is σ = 664078638748. Its totient is φ = 569210261760.

The previous prime is 616644450241. The next prime is 616644450271. The reversal of 616644450253 is 352054446616.

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 102975526404 + 513668923849 = 320898^2 + 716707^2 .

It is a cyclic number.

It is not a de Polignac number, because 616644450253 - 2¹³ = 616644442061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616644450223) 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, 23717094228 + ... + 23717094253.

It is an arithmetic number, because the mean of its divisors is an integer number (166019659687).

Almost surely, 2^616644450253 is an apocalyptic number.

It is an amenable number.

616644450253 is a deficient number, since it is larger than the sum of its proper divisors (47434188495).

616644450253 is a wasteful number, since it uses less digits than its factorization.

616644450253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47434188494.

The product of its (nonzero) digits is 2073600, while the sum is 46.

Adding to 616644450253 its reverse (352054446616), we get a palindrome (968698896869).

The spelling of 616644450253 in words is "six hundred sixteen billion, six hundred forty-four million, four hundred fifty thousand, two hundred fifty-three".