616665457 has 2 divisors, whose sum is σ = 616665458. Its totient is φ = 616665456.

The previous prime is 616665407. The next prime is 616665473. The reversal of 616665457 is 754566616.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 610633521 + 6031936 = 24711^2 + 2456^2 .

It is a cyclic number.

It is not a de Polignac number, because 616665457 - 2¹¹ = 616663409 is a prime.

It is not a weakly prime, because it can be changed into another prime (616665407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308332728 + 308332729.

It is an arithmetic number, because the mean of its divisors is an integer number (308332729).

Almost surely, 2^616665457 is an apocalyptic number.

It is an amenable number.

616665457 is a deficient number, since it is larger than the sum of its proper divisors (1).

616665457 is an equidigital number, since it uses as much as digits as its factorization.

616665457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 907200, while the sum is 46.

The square root of 616665457 is about 24832.7496866537. The cubic root of 616665457 is about 851.1704553559.

The spelling of 616665457 in words is "six hundred sixteen million, six hundred sixty-five thousand, four hundred fifty-seven".