251220502051553 has 2 divisors, whose sum is σ = 251220502051554. Its totient is φ = 251220502051552.

The previous prime is 251220502051459. The next prime is 251220502051579. The reversal of 251220502051553 is 355150205022152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 201607398117904 + 49613103933649 = 14198852^2 + 7043657^2 .

It is a cyclic number.

It is not a de Polignac number, because 251220502051553 - 2¹² = 251220502047457 is a prime.

It is a super-2 number, since 2×251220502051553² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (251220502051583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125610251025776 + 125610251025777.

It is an arithmetic number, because the mean of its divisors is an integer number (125610251025777).

Almost surely, 2^{251220502051553} is an apocalyptic number.

It is an amenable number.

251220502051553 is a deficient number, since it is larger than the sum of its proper divisors (1).

251220502051553 is an equidigital number, since it uses as much as digits as its factorization.

251220502051553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 150000, while the sum is 38.

The spelling of 251220502051553 in words is "two hundred fifty-one trillion, two hundred twenty billion, five hundred two million, fifty-one thousand, five hundred fifty-three".