55532991809 has 12 divisors (see below), whose sum is σ = 59038310400. Its totient is φ = 52225132608.

The previous prime is 55532991797. The next prime is 55532991863. The reversal of 55532991809 is 90819923555.

It is not a de Polignac number, because 55532991809 - 2⁴ = 55532991793 is a prime.

It is a super-2 number, since 2×55532991809² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (55532291809) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 294512 + ... + 444750.

It is an arithmetic number, because the mean of its divisors is an integer number (4919859200).

Almost surely, 2^55532991809 is an apocalyptic number.

It is an amenable number.

55532991809 is a deficient number, since it is larger than the sum of its proper divisors (3505318591).

55532991809 is a wasteful number, since it uses less digits than its factorization.

55532991809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151552 (or 151535 counting only the distinct ones).

The product of its (nonzero) digits is 4374000, while the sum is 56.

The spelling of 55532991809 in words is "fifty-five billion, five hundred thirty-two million, nine hundred ninety-one thousand, eight hundred nine".