55646438413 has 2 divisors, whose sum is σ = 55646438414. Its totient is φ = 55646438412.

The previous prime is 55646438383. The next prime is 55646438437. The reversal of 55646438413 is 31483464655.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35208019044 + 20438419369 = 187638^2 + 142963^2 .

It is a cyclic number.

It is not a de Polignac number, because 55646438413 - 2²¹ = 55644341261 is a prime.

It is a super-2 number, since 2×55646438413² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55646438473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27823219206 + 27823219207.

It is an arithmetic number, because the mean of its divisors is an integer number (27823219207).

Almost surely, 2^55646438413 is an apocalyptic number.

It is an amenable number.

55646438413 is a deficient number, since it is larger than the sum of its proper divisors (1).

55646438413 is an equidigital number, since it uses as much as digits as its factorization.

55646438413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4147200, while the sum is 49.

The spelling of 55646438413 in words is "fifty-five billion, six hundred forty-six million, four hundred thirty-eight thousand, four hundred thirteen".