55612356421 has 2 divisors, whose sum is σ = 55612356422. Its totient is φ = 55612356420.

The previous prime is 55612356389. The next prime is 55612356461. The reversal of 55612356421 is 12465321655.

55612356421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (55612356461) can be obtained adding 55612356421 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52906900225 + 2705456196 = 230015^2 + 52014^2 .

It is a cyclic number.

It is not a de Polignac number, because 55612356421 - 2⁵ = 55612356389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55612356461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27806178210 + 27806178211.

It is an arithmetic number, because the mean of its divisors is an integer number (27806178211).

Almost surely, 2^55612356421 is an apocalyptic number.

It is an amenable number.

55612356421 is a deficient number, since it is larger than the sum of its proper divisors (1).

55612356421 is an equidigital number, since it uses as much as digits as its factorization.

55612356421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216000, while the sum is 40.

The spelling of 55612356421 in words is "fifty-five billion, six hundred twelve million, three hundred fifty-six thousand, four hundred twenty-one".