55455502391 has 2 divisors, whose sum is σ = 55455502392. Its totient is φ = 55455502390.

The previous prime is 55455502381. The next prime is 55455502451. The reversal of 55455502391 is 19320555455.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55455502391 - 2⁶ = 55455502327 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55455502321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27727751195 + 27727751196.

It is an arithmetic number, because the mean of its divisors is an integer number (27727751196).

Almost surely, 2^55455502391 is an apocalyptic number.

55455502391 is a deficient number, since it is larger than the sum of its proper divisors (1).

55455502391 is an equidigital number, since it uses as much as digits as its factorization.

55455502391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 675000, while the sum is 44.

The spelling of 55455502391 in words is "fifty-five billion, four hundred fifty-five million, five hundred two thousand, three hundred ninety-one".