616145261 has 4 divisors (see below), whose sum is σ = 622497372. Its totient is φ = 609793152.

The previous prime is 616145251. The next prime is 616145273. The reversal of 616145261 is 162541616.

616145261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 395771236 + 220374025 = 19894^2 + 14845^2 .

It is a cyclic number.

It is not a de Polignac number, because 616145261 - 2²² = 611950957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616145251) 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, 3175910 + ... + 3176103.

It is an arithmetic number, because the mean of its divisors is an integer number (155624343).

Almost surely, 2^616145261 is an apocalyptic number.

It is an amenable number.

616145261 is a deficient number, since it is larger than the sum of its proper divisors (6352111).

616145261 is an equidigital number, since it uses as much as digits as its factorization.

616145261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6352110.

The product of its digits is 8640, while the sum is 32.

The square root of 616145261 is about 24822.2734857225. The cubic root of 616145261 is about 850.9310494660.

Adding to 616145261 its reverse (162541616), we get a palindrome (778686877).

The spelling of 616145261 in words is "six hundred sixteen million, one hundred forty-five thousand, two hundred sixty-one".