472777558418021 has 2 divisors, whose sum is σ = 472777558418022. Its totient is φ = 472777558418020.

The previous prime is 472777558417993. The next prime is 472777558418023. The reversal of 472777558418021 is 120814855777274.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 240199472656900 + 232578085761121 = 15498370^2 + 15250511^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-472777558418021 is a prime.

Together with 472777558418023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (472777558418023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 236388779209010 + 236388779209011.

It is an arithmetic number, because the mean of its divisors is an integer number (236388779209011).

Almost surely, 2^{472777558418021} is an apocalyptic number.

It is an amenable number.

472777558418021 is a deficient number, since it is larger than the sum of its proper divisors (1).

472777558418021 is an equidigital number, since it uses as much as digits as its factorization.

472777558418021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 245862400, while the sum is 68.

The spelling of 472777558418021 in words is "four hundred seventy-two trillion, seven hundred seventy-seven billion, five hundred fifty-eight million, four hundred eighteen thousand, twenty-one".