616561245 has 24 divisors (see below), whose sum is σ = 1069286400. Its totient is φ = 328654176.

The previous prime is 616561241. The next prime is 616561249. The reversal of 616561245 is 542165616.

It is an interprime number because it is at equal distance from previous prime (616561241) and next prime (616561249).

It is not a de Polignac number, because 616561245 - 2² = 616561241 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616561241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 149116 + ... + 153194.

It is an arithmetic number, because the mean of its divisors is an integer number (44553600).

Almost surely, 2^616561245 is an apocalyptic number.

It is an amenable number.

616561245 is a deficient number, since it is larger than the sum of its proper divisors (452725155).

616561245 is a wasteful number, since it uses less digits than its factorization.

616561245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7449 (or 7446 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 616561245 is about 24830.6513204950. The cubic root of 616561245 is about 851.1225054388.

The spelling of 616561245 in words is "six hundred sixteen million, five hundred sixty-one thousand, two hundred forty-five".