55389033661 has 16 divisors (see below), whose sum is σ = 59932251904. Its totient is φ = 50886615744.

The previous prime is 55389033647. The next prime is 55389033703. The reversal of 55389033661 is 16633098355.

It is a cyclic number.

It is not a de Polignac number, because 55389033661 - 2¹¹ = 55389031613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55389033061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3217900 + ... + 3235066.

It is an arithmetic number, because the mean of its divisors is an integer number (3745765744).

Almost surely, 2^55389033661 is an apocalyptic number.

It is an amenable number.

55389033661 is a deficient number, since it is larger than the sum of its proper divisors (4543218243).

55389033661 is a wasteful number, since it uses less digits than its factorization.

55389033661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18340.

The product of its (nonzero) digits is 1749600, while the sum is 49.

The spelling of 55389033661 in words is "fifty-five billion, three hundred eighty-nine million, thirty-three thousand, six hundred sixty-one".