616666651 has 8 divisors (see below), whose sum is σ = 622946160. Its totient is φ = 610401792.

The previous prime is 616666627. The next prime is 616666657. The reversal of 616666651 is 156666616.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-616666651 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 616666598 and 616666607.

It is not an unprimeable number, because it can be changed into a prime (616666657) 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 7 ways as a sum of consecutive naturals, for example, 93891 + ... + 100243.

It is an arithmetic number, because the mean of its divisors is an integer number (77868270).

Almost surely, 2^616666651 is an apocalyptic number.

616666651 is a deficient number, since it is larger than the sum of its proper divisors (6279509).

616666651 is a wasteful number, since it uses less digits than its factorization.

616666651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7325.

The product of its digits is 233280, while the sum is 43.

The square root of 616666651 is about 24832.7737274756. The cubic root of 616666651 is about 851.1710047066.

The spelling of 616666651 in words is "six hundred sixteen million, six hundred sixty-six thousand, six hundred fifty-one".