616660985 has 8 divisors (see below), whose sum is σ = 742520520. Its totient is φ = 491643904.

The previous prime is 616660973. The next prime is 616660991. The reversal of 616660985 is 589066616.

It can be written as a sum of positive squares in 4 ways, for example, as 100962304 + 515698681 = 10048^2 + 22709^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 616660985 - 2⁴ = 616660969 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 209000 + ... + 211929.

It is an arithmetic number, because the mean of its divisors is an integer number (92815065).

Almost surely, 2^616660985 is an apocalyptic number.

It is an amenable number.

616660985 is a deficient number, since it is larger than the sum of its proper divisors (125859535).

616660985 is a wasteful number, since it uses less digits than its factorization.

616660985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421227.

The product of its (nonzero) digits is 466560, while the sum is 47.

The square root of 616660985 is about 24832.6596441058. The cubic root of 616660985 is about 851.1683978148.

The spelling of 616660985 in words is "six hundred sixteen million, six hundred sixty thousand, nine hundred eighty-five".