616537161 has 12 divisors (see below), whose sum is σ = 890887920. Its totient is φ = 410870520.

The previous prime is 616537157. The next prime is 616537169. The reversal of 616537161 is 161735616.

616537161 is a `hidden beast` number, since 61 + 6 + 537 + 1 + 61 = 666.

It is not a de Polignac number, because 616537161 - 2² = 616537157 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (616537169) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15826 + ... + 38516.

It is an arithmetic number, because the mean of its divisors is an integer number (74240660).

Almost surely, 2^616537161 is an apocalyptic number.

It is an amenable number.

616537161 is a deficient number, since it is larger than the sum of its proper divisors (274350759).

616537161 is a wasteful number, since it uses less digits than its factorization.

616537161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25716 (or 25713 counting only the distinct ones).

The product of its digits is 22680, while the sum is 36.

The square root of 616537161 is about 24830.1663506308. The cubic root of 616537161 is about 851.1114231651. Note that the first 3 decimals are identical.

The spelling of 616537161 in words is "six hundred sixteen million, five hundred thirty-seven thousand, one hundred sixty-one".