51205053213157 has 2 divisors, whose sum is σ = 51205053213158. Its totient is φ = 51205053213156.

The previous prime is 51205053213059. The next prime is 51205053213173. The reversal of 51205053213157 is 75131235050215.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33879221383396 + 17325831829761 = 5820586^2 + 4162431^2 .

It is a cyclic number.

It is not a de Polignac number, because 51205053213157 - 2¹⁹ = 51205052688869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51205053216157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25602526606578 + 25602526606579.

It is an arithmetic number, because the mean of its divisors is an integer number (25602526606579).

Almost surely, 2^{51205053213157} is an apocalyptic number.

It is an amenable number.

51205053213157 is a deficient number, since it is larger than the sum of its proper divisors (1).

51205053213157 is an equidigital number, since it uses as much as digits as its factorization.

51205053213157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 157500, while the sum is 40.

The spelling of 51205053213157 in words is "fifty-one trillion, two hundred five billion, fifty-three million, two hundred thirteen thousand, one hundred fifty-seven".