55645339987 has 2 divisors, whose sum is σ = 55645339988. Its totient is φ = 55645339986.

The previous prime is 55645339949. The next prime is 55645339999. The reversal of 55645339987 is 78993354655.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55645339987 - 2²³ = 55636951379 is a prime.

It is not a weakly prime, because it can be changed into another prime (55645339927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27822669993 + 27822669994.

It is an arithmetic number, because the mean of its divisors is an integer number (27822669994).

Almost surely, 2^55645339987 is an apocalyptic number.

55645339987 is a deficient number, since it is larger than the sum of its proper divisors (1).

55645339987 is an equidigital number, since it uses as much as digits as its factorization.

55645339987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 122472000, while the sum is 64.

The spelling of 55645339987 in words is "fifty-five billion, six hundred forty-five million, three hundred thirty-nine thousand, nine hundred eighty-seven".