550005001261 has 2 divisors, whose sum is σ = 550005001262. Its totient is φ = 550005001260.

The previous prime is 550005001241. The next prime is 550005001283. The reversal of 550005001261 is 162100500055.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 302890626025 + 247114375236 = 550355^2 + 497106^2 .

It is a cyclic number.

It is not a de Polignac number, because 550005001261 - 2¹⁵ = 550004968493 is a prime.

It is a super-2 number, since 2×550005001261² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (550005001241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275002500630 + 275002500631.

It is an arithmetic number, because the mean of its divisors is an integer number (275002500631).

Almost surely, 2^550005001261 is an apocalyptic number.

It is an amenable number.

550005001261 is a deficient number, since it is larger than the sum of its proper divisors (1).

550005001261 is an equidigital number, since it uses as much as digits as its factorization.

550005001261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1500, while the sum is 25.

The spelling of 550005001261 in words is "five hundred fifty billion, five million, one thousand, two hundred sixty-one".