55533434521 has 2 divisors, whose sum is σ = 55533434522. Its totient is φ = 55533434520.

The previous prime is 55533434513. The next prime is 55533434573. The reversal of 55533434521 is 12543433555.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46722984025 + 8810450496 = 216155^2 + 93864^2 .

It is a cyclic number.

It is not a de Polignac number, because 55533434521 - 2³ = 55533434513 is a prime.

It is not a weakly prime, because it can be changed into another prime (55533434221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27766717260 + 27766717261.

It is an arithmetic number, because the mean of its divisors is an integer number (27766717261).

Almost surely, 2^55533434521 is an apocalyptic number.

It is an amenable number.

55533434521 is a deficient number, since it is larger than the sum of its proper divisors (1).

55533434521 is an equidigital number, since it uses as much as digits as its factorization.

55533434521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 540000, while the sum is 40.

The spelling of 55533434521 in words is "fifty-five billion, five hundred thirty-three million, four hundred thirty-four thousand, five hundred twenty-one".