617666047 has 2 divisors, whose sum is σ = 617666048. Its totient is φ = 617666046.

The previous prime is 617666029. The next prime is 617666051. The reversal of 617666047 is 740666716.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 617666047 - 2¹⁵ = 617633279 is a prime.

It is a super-2 number, since 2×617666047² = 763022691233212418, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 617665994 and 617666012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (617666017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308833023 + 308833024.

It is an arithmetic number, because the mean of its divisors is an integer number (308833024).

Almost surely, 2^617666047 is an apocalyptic number.

617666047 is a deficient number, since it is larger than the sum of its proper divisors (1).

617666047 is an equidigital number, since it uses as much as digits as its factorization.

617666047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 254016, while the sum is 43.

The square root of 617666047 is about 24852.8881017881. Note that the first 3 decimals coincide. The cubic root of 617666047 is about 851.6305710826.

The spelling of 617666047 in words is "six hundred seventeen million, six hundred sixty-six thousand, forty-seven".