55645397447 has 2 divisors, whose sum is σ = 55645397448. Its totient is φ = 55645397446.

The previous prime is 55645397419. The next prime is 55645397567. The reversal of 55645397447 is 74479354655.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55645397447 - 2²² = 55641203143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55645390447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27822698723 + 27822698724.

It is an arithmetic number, because the mean of its divisors is an integer number (27822698724).

Almost surely, 2^55645397447 is an apocalyptic number.

55645397447 is a deficient number, since it is larger than the sum of its proper divisors (1).

55645397447 is an equidigital number, since it uses as much as digits as its factorization.

55645397447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63504000, while the sum is 59.

The spelling of 55645397447 in words is "fifty-five billion, six hundred forty-five million, three hundred ninety-seven thousand, four hundred forty-seven".