616853945 has 4 divisors (see below), whose sum is σ = 740224740. Its totient is φ = 493483152.

The previous prime is 616853933. The next prime is 616853947. The reversal of 616853945 is 549358616.

It is a happy number.

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 139169209 + 477684736 = 11797^2 + 21856^2 .

It is a cyclic number.

It is not a de Polignac number, because 616853945 - 2⁴ = 616853929 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 616853945.

It is not an unprimeable number, because it can be changed into a prime (616853947) 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, 61685390 + ... + 61685399.

It is an arithmetic number, because the mean of its divisors is an integer number (185056185).

Almost surely, 2^616853945 is an apocalyptic number.

It is an amenable number.

616853945 is a deficient number, since it is larger than the sum of its proper divisors (123370795).

616853945 is a wasteful number, since it uses less digits than its factorization.

616853945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123370794.

The product of its digits is 777600, while the sum is 47.

The square root of 616853945 is about 24836.5445462931. The cubic root of 616853945 is about 851.2571685387.

The spelling of 616853945 in words is "six hundred sixteen million, eight hundred fifty-three thousand, nine hundred forty-five".