47778470477 has 2 divisors, whose sum is σ = 47778470478. Its totient is φ = 47778470476.

The previous prime is 47778470387. The next prime is 47778470497. The reversal of 47778470477 is 77407487774.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36171855721 + 11606614756 = 190189^2 + 107734^2 .

It is a cyclic number.

It is not a de Polignac number, because 47778470477 - 2¹⁶ = 47778404941 is a prime.

It is a super-2 number, since 2×47778470477² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47778470497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23889235238 + 23889235239.

It is an arithmetic number, because the mean of its divisors is an integer number (23889235239).

Almost surely, 2^47778470477 is an apocalyptic number.

It is an amenable number.

47778470477 is a deficient number, since it is larger than the sum of its proper divisors (1).

47778470477 is an equidigital number, since it uses as much as digits as its factorization.

47778470477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60236288, while the sum is 62.

The spelling of 47778470477 in words is "forty-seven billion, seven hundred seventy-eight million, four hundred seventy thousand, four hundred seventy-seven".