647034763121 has 2 divisors, whose sum is σ = 647034763122. Its totient is φ = 647034763120.

The previous prime is 647034763093. The next prime is 647034763169. The reversal of 647034763121 is 121367430746.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 499056060721 + 147978702400 = 706439^2 + 384680^2 .

It is a cyclic number.

It is not a de Polignac number, because 647034763121 - 2²² = 647030568817 is a prime.

It is not a weakly prime, because it can be changed into another prime (647034763181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323517381560 + 323517381561.

It is an arithmetic number, because the mean of its divisors is an integer number (323517381561).

Almost surely, 2^647034763121 is an apocalyptic number.

It is an amenable number.

647034763121 is a deficient number, since it is larger than the sum of its proper divisors (1).

647034763121 is an equidigital number, since it uses as much as digits as its factorization.

647034763121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 508032, while the sum is 44.

The spelling of 647034763121 in words is "six hundred forty-seven billion, thirty-four million, seven hundred sixty-three thousand, one hundred twenty-one".