17780655047 has 2 divisors, whose sum is σ = 17780655048. Its totient is φ = 17780655046.

The previous prime is 17780654987. The next prime is 17780655059. The reversal of 17780655047 is 74055608771.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 17780655047 - 2³² = 13485687751 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 17780654986 and 17780655004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17780655097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8890327523 + 8890327524.

It is an arithmetic number, because the mean of its divisors is an integer number (8890327524).

Almost surely, 2^17780655047 is an apocalyptic number.

17780655047 is a deficient number, since it is larger than the sum of its proper divisors (1).

17780655047 is an equidigital number, since it uses as much as digits as its factorization.

17780655047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1646400, while the sum is 50.

The spelling of 17780655047 in words is "seventeen billion, seven hundred eighty million, six hundred fifty-five thousand, forty-seven".