616599997 has 18 divisors (see below), whose sum is σ = 680530074. Its totient is φ = 555367680.

The previous prime is 616599941. The next prime is 616600007. The reversal of 616599997 is 799995616.

It can be written as a sum of positive squares in 3 ways, for example, as 13111641 + 603488356 = 3621^2 + 24566^2 .

It is not a de Polignac number, because 616599997 - 2¹⁵ = 616567229 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 (616599397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 6356653 + ... + 6356749.

Almost surely, 2^616599997 is an apocalyptic number.

It is an amenable number.

616599997 is a deficient number, since it is larger than the sum of its proper divisors (63930077).

616599997 is an frugal number, since it uses more digits than its factorization.

616599997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349 (or 181 counting only the distinct ones).

The product of its digits is 8266860, while the sum is 61.

The square root of 616599997 is about 24831.4316341205. The cubic root of 616599997 is about 851.1403365997.

The spelling of 616599997 in words is "six hundred sixteen million, five hundred ninety-nine thousand, nine hundred ninety-seven".