55280720081 has 2 divisors, whose sum is σ = 55280720082. Its totient is φ = 55280720080.

The previous prime is 55280720059. The next prime is 55280720123. The reversal of 55280720081 is 18002708255.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53259408400 + 2021311681 = 230780^2 + 44959^2 .

It is a cyclic number.

It is not a de Polignac number, because 55280720081 - 2¹⁸ = 55280457937 is a prime.

It is a super-2 number, since 2×55280720081² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (55280720281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27640360040 + 27640360041.

It is an arithmetic number, because the mean of its divisors is an integer number (27640360041).

Almost surely, 2^55280720081 is an apocalyptic number.

It is an amenable number.

55280720081 is a deficient number, since it is larger than the sum of its proper divisors (1).

55280720081 is an equidigital number, since it uses as much as digits as its factorization.

55280720081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 44800, while the sum is 38.

The spelling of 55280720081 in words is "fifty-five billion, two hundred eighty million, seven hundred twenty thousand, eighty-one".