616665406 has 32 divisors (see below), whose sum is σ = 1120320000. Its totient is φ = 248679072.

The previous prime is 616665377. The next prime is 616665407. The reversal of 616665406 is 604566616.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616665407) 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 15 ways as a sum of consecutive naturals, for example, 31855 + ... + 47413.

It is an arithmetic number, because the mean of its divisors is an integer number (35010000).

Almost surely, 2^616665406 is an apocalyptic number.

616665406 is a deficient number, since it is larger than the sum of its proper divisors (503654594).

616665406 is a wasteful number, since it uses less digits than its factorization.

616665406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15736.

The product of its (nonzero) digits is 155520, while the sum is 40.

The square root of 616665406 is about 24832.7486597839. The cubic root of 616665406 is about 851.1704318911.

The spelling of 616665406 in words is "six hundred sixteen million, six hundred sixty-five thousand, four hundred six".