55500050561 has 2 divisors, whose sum is σ = 55500050562. Its totient is φ = 55500050560.

The previous prime is 55500050549. The next prime is 55500050581. The reversal of 55500050561 is 16505000555.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48893612161 + 6606438400 = 221119^2 + 81280^2 .

It is a cyclic number.

It is not a de Polignac number, because 55500050561 - 2³⁴ = 38320181377 is a prime.

It is a super-2 number, since 2×55500050561² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (55500050531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27750025280 + 27750025281.

It is an arithmetic number, because the mean of its divisors is an integer number (27750025281).

Almost surely, 2^55500050561 is an apocalyptic number.

It is an amenable number.

55500050561 is a deficient number, since it is larger than the sum of its proper divisors (1).

55500050561 is an equidigital number, since it uses as much as digits as its factorization.

55500050561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18750, while the sum is 32.

The spelling of 55500050561 in words is "fifty-five billion, five hundred million, fifty thousand, five hundred sixty-one".