616666481 has 4 divisors (see below), whose sum is σ = 616896000. Its totient is φ = 616436964.

The previous prime is 616666447. The next prime is 616666549. The reversal of 616666481 is 184666616.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 616666481 - 2⁶ = 616666417 is a prime.

It is a super-2 number, since 2×616666481² = 760555097577846722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (616666441) 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 3 ways as a sum of consecutive naturals, for example, 110681 + ... + 116118.

It is an arithmetic number, because the mean of its divisors is an integer number (154224000).

Almost surely, 2^616666481 is an apocalyptic number.

It is an amenable number.

616666481 is a deficient number, since it is larger than the sum of its proper divisors (229519).

616666481 is a wasteful number, since it uses less digits than its factorization.

616666481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229518.

The product of its digits is 248832, while the sum is 44.

The square root of 616666481 is about 24832.7703045794. The cubic root of 616666481 is about 851.1709264909.

The spelling of 616666481 in words is "six hundred sixteen million, six hundred sixty-six thousand, four hundred eighty-one".