616533121513 has 4 divisors (see below), whose sum is σ = 616536887620. Its totient is φ = 616529355408.

The previous prime is 616533121511. The next prime is 616533121549. The reversal of 616533121513 is 315121335616.

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 591834798864 + 24698322649 = 769308^2 + 157157^2 .

It is a cyclic number.

It is not a de Polignac number, because 616533121513 - 2¹ = 616533121511 is a prime.

It is a super-2 number, since 2×616533121513² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (616533121511) 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, 1625778 + ... + 1968811.

It is an arithmetic number, because the mean of its divisors is an integer number (154134221905).

Almost surely, 2^616533121513 is an apocalyptic number.

It is an amenable number.

616533121513 is a deficient number, since it is larger than the sum of its proper divisors (3766107).

616533121513 is a wasteful number, since it uses less digits than its factorization.

616533121513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3766106.

The product of its digits is 48600, while the sum is 37.

The spelling of 616533121513 in words is "six hundred sixteen billion, five hundred thirty-three million, one hundred twenty-one thousand, five hundred thirteen".