128973203761 has 2 divisors, whose sum is σ = 128973203762. Its totient is φ = 128973203760.

The previous prime is 128973203693. The next prime is 128973203767. The reversal of 128973203761 is 167302379821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 128837923600 + 135280161 = 358940^2 + 11631^2 .

It is a cyclic number.

It is not a de Polignac number, because 128973203761 - 2⁷ = 128973203633 is a prime.

It is not a weakly prime, because it can be changed into another prime (128973203767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64486601880 + 64486601881.

It is an arithmetic number, because the mean of its divisors is an integer number (64486601881).

Almost surely, 2^128973203761 is an apocalyptic number.

It is an amenable number.

128973203761 is a deficient number, since it is larger than the sum of its proper divisors (1).

128973203761 is an equidigital number, since it uses as much as digits as its factorization.

128973203761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 762048, while the sum is 49.

The spelling of 128973203761 in words is "one hundred twenty-eight billion, nine hundred seventy-three million, two hundred three thousand, seven hundred sixty-one".