616665407 has 2 divisors, whose sum is σ = 616665408. Its totient is φ = 616665406.

The previous prime is 616665377. The next prime is 616665457. The reversal of 616665407 is 704566616.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 616665407 - 2¹⁶ = 616599871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (616665457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308332703 + 308332704.

It is an arithmetic number, because the mean of its divisors is an integer number (308332704).

Almost surely, 2^616665407 is an apocalyptic number.

616665407 is a deficient number, since it is larger than the sum of its proper divisors (1).

616665407 is an equidigital number, since it uses as much as digits as its factorization.

616665407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 181440, while the sum is 41.

The square root of 616665407 is about 24832.7486799186. The cubic root of 616665407 is about 851.1704323512.

The spelling of 616665407 in words is "six hundred sixteen million, six hundred sixty-five thousand, four hundred seven".