55197720913 has 2 divisors, whose sum is σ = 55197720914. Its totient is φ = 55197720912.

The previous prime is 55197720883. The next prime is 55197721003. The reversal of 55197720913 is 31902779155.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49795029904 + 5402691009 = 223148^2 + 73503^2 .

It is a cyclic number.

It is not a de Polignac number, because 55197720913 - 2²⁹ = 54660850001 is a prime.

It is not a weakly prime, because it can be changed into another prime (55197720113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27598860456 + 27598860457.

It is an arithmetic number, because the mean of its divisors is an integer number (27598860457).

Almost surely, 2^55197720913 is an apocalyptic number.

It is an amenable number.

55197720913 is a deficient number, since it is larger than the sum of its proper divisors (1).

55197720913 is an equidigital number, since it uses as much as digits as its factorization.

55197720913 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 595350, while the sum is 49.

The spelling of 55197720913 in words is "fifty-five billion, one hundred ninety-seven million, seven hundred twenty thousand, nine hundred thirteen".