55143242491 has 2 divisors, whose sum is σ = 55143242492. Its totient is φ = 55143242490.

The previous prime is 55143242449. The next prime is 55143242521. The reversal of 55143242491 is 19424234155.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55143242491 - 2¹⁹ = 55142718203 is a prime.

It is not a weakly prime, because it can be changed into another prime (55143242191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27571621245 + 27571621246.

It is an arithmetic number, because the mean of its divisors is an integer number (27571621246).

Almost surely, 2^55143242491 is an apocalyptic number.

55143242491 is a deficient number, since it is larger than the sum of its proper divisors (1).

55143242491 is an equidigital number, since it uses as much as digits as its factorization.

55143242491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 172800, while the sum is 40.

The spelling of 55143242491 in words is "fifty-five billion, one hundred forty-three million, two hundred forty-two thousand, four hundred ninety-one".