616554981 has 24 divisors (see below), whose sum is σ = 1019079360. Its totient is φ = 351876096.

The previous prime is 616554979. The next prime is 616555003. The reversal of 616554981 is 189455616.

616554981 is a `hidden beast` number, since 6 + 1 + 6 + 554 + 98 + 1 = 666.

It is not a de Polignac number, because 616554981 - 2¹ = 616554979 is a prime.

It is a super-2 number, since 2×616554981² = 760280089191820722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616554931) 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, 48421 + ... + 59813.

It is an arithmetic number, because the mean of its divisors is an integer number (42461640).

Almost surely, 2^616554981 is an apocalyptic number.

It is an amenable number.

616554981 is a deficient number, since it is larger than the sum of its proper divisors (402524379).

616554981 is a wasteful number, since it uses less digits than its factorization.

616554981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12265 (or 12262 counting only the distinct ones).

The product of its digits is 259200, while the sum is 45.

The square root of 616554981 is about 24830.5251857467. The cubic root of 616554981 is about 851.1196230815.

The spelling of 616554981 in words is "six hundred sixteen million, five hundred fifty-four thousand, nine hundred eighty-one".