55776013213 has 2 divisors, whose sum is σ = 55776013214. Its totient is φ = 55776013212.

The previous prime is 55776013211. The next prime is 55776013231. The reversal of 55776013213 is 31231067755.

It is a happy number.

Together with next prime (55776013231) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46054447609 + 9721565604 = 214603^2 + 98598^2 .

It is a cyclic number.

It is not a de Polignac number, because 55776013213 - 2¹ = 55776013211 is a prime.

It is a super-2 number, since 2×55776013213² (a number of 22 digits) contains 22 as substring.

Together with 55776013211, 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 (55776013211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27888006606 + 27888006607.

It is an arithmetic number, because the mean of its divisors is an integer number (27888006607).

Almost surely, 2^55776013213 is an apocalyptic number.

It is an amenable number.

55776013213 is a deficient number, since it is larger than the sum of its proper divisors (1).

55776013213 is an equidigital number, since it uses as much as digits as its factorization.

55776013213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 132300, while the sum is 40.

The spelling of 55776013213 in words is "fifty-five billion, seven hundred seventy-six million, thirteen thousand, two hundred thirteen".