55499999551 has 2 divisors, whose sum is σ = 55499999552. Its totient is φ = 55499999550.

The previous prime is 55499999549. The next prime is 55499999573. The reversal of 55499999551 is 15599999455.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55499999551 - 2¹ = 55499999549 is a prime.

It is a super-2 number, since 2×55499999551² (a number of 22 digits) contains 22 as substring.

Together with 55499999549, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55499999531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27749999775 + 27749999776.

It is an arithmetic number, because the mean of its divisors is an integer number (27749999776).

Almost surely, 2^55499999551 is an apocalyptic number.

55499999551 is a deficient number, since it is larger than the sum of its proper divisors (1).

55499999551 is an equidigital number, since it uses as much as digits as its factorization.

55499999551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 147622500, while the sum is 70.

The spelling of 55499999551 in words is "fifty-five billion, four hundred ninety-nine million, nine hundred ninety-nine thousand, five hundred fifty-one".