51267891225721 has 2 divisors, whose sum is σ = 51267891225722. Its totient is φ = 51267891225720.

The previous prime is 51267891225553. The next prime is 51267891225869. The reversal of 51267891225721 is 12752219876215.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51267891225600 + 121 = 7160160^2 + 11^2 .

It is a cyclic number.

It is not a de Polignac number, because 51267891225721 - 2⁹ = 51267891225209 is a prime.

It is not a weakly prime, because it can be changed into another prime (51267891225121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25633945612860 + 25633945612861.

It is an arithmetic number, because the mean of its divisors is an integer number (25633945612861).

Almost surely, 2^{51267891225721} is an apocalyptic number.

It is an amenable number.

51267891225721 is a deficient number, since it is larger than the sum of its proper divisors (1).

51267891225721 is an equidigital number, since it uses as much as digits as its factorization.

51267891225721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8467200, while the sum is 58.

The spelling of 51267891225721 in words is "fifty-one trillion, two hundred sixty-seven billion, eight hundred ninety-one million, two hundred twenty-five thousand, seven hundred twenty-one".