1778056417 has 2 divisors, whose sum is σ = 1778056418. Its totient is φ = 1778056416.

The previous prime is 1778056363. The next prime is 1778056421. The reversal of 1778056417 is 7146508771.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1766604961 + 11451456 = 42031^2 + 3384^2 .

It is a cyclic number.

It is not a de Polignac number, because 1778056417 - 2¹⁵ = 1778023649 is a prime.

It is a super-2 number, since 2×1778056417² = 6322969244069755778, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1778056457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 889028208 + 889028209.

It is an arithmetic number, because the mean of its divisors is an integer number (889028209).

Almost surely, 2^1778056417 is an apocalyptic number.

It is an amenable number.

1778056417 is a deficient number, since it is larger than the sum of its proper divisors (1).

1778056417 is an equidigital number, since it uses as much as digits as its factorization.

1778056417 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 329280, while the sum is 46.

The square root of 1778056417 is about 42167.0062608196. The cubic root of 1778056417 is about 1211.4770153820.

The spelling of 1778056417 in words is "one billion, seven hundred seventy-eight million, fifty-six thousand, four hundred seventeen".